Revert of Moves SQLitePersistentCookieStore to net/extras/sqlite.

net/extras/sqlite/sqlite_persistent_cookie_store.cc

Index: net/extras/sqlite/sqlite_persistent_cookie_store.cc
diff --git a/net/extras/sqlite/sqlite_persistent_cookie_store.cc b/net/extras/sqlite/sqlite_persistent_cookie_store.cc
deleted file mode 100644
index 9fdb0704d9867876e96ed11e9524ab5bd95c86f0..0000000000000000000000000000000000000000
--- a/net/extras/sqlite/sqlite_persistent_cookie_store.cc
+++ /dev/null
@@ -1,1366 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "net/extras/sqlite/sqlite_persistent_cookie_store.h"
-
-#include <map>
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/metrics/field_trial.h"
-#include "base/metrics/histogram.h"
-#include "base/profiler/scoped_tracker.h"
-#include "base/sequenced_task_runner.h"
-#include "base/strings/string_util.h"
-#include "base/strings/stringprintf.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/sequenced_worker_pool.h"
-#include "base/time/time.h"
-#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
-#include "net/cookies/canonical_cookie.h"
-#include "net/cookies/cookie_constants.h"
-#include "net/cookies/cookie_util.h"
-#include "net/extras/sqlite/cookie_crypto_delegate.h"
-#include "sql/error_delegate_util.h"
-#include "sql/meta_table.h"
-#include "sql/statement.h"
-#include "sql/transaction.h"
-#include "url/gurl.h"
-
-using base::Time;
-
-namespace {
-
-// The persistent cookie store is loaded into memory on eTLD at a time. This
-// variable controls the delay between loading eTLDs, so as to not overload the
-// CPU or I/O with these low priority requests immediately after start up.
-const int kLoadDelayMilliseconds = 0;
-
-}  // namespace
-
-namespace net {
-
-// This class is designed to be shared between any client thread and the
-// background task runner. It batches operations and commits them on a timer.
-//
-// SQLitePersistentCookieStore::Load is called to load all cookies.  It
-// delegates to Backend::Load, which posts a Backend::LoadAndNotifyOnDBThread
-// task to the background runner.  This task calls Backend::ChainLoadCookies(),
-// which repeatedly posts itself to the BG runner to load each eTLD+1's cookies
-// in separate tasks.  When this is complete, Backend::CompleteLoadOnIOThread is
-// posted to the client runner, which notifies the caller of
-// SQLitePersistentCookieStore::Load that the load is complete.
-//
-// If a priority load request is invoked via SQLitePersistentCookieStore::
-// LoadCookiesForKey, it is delegated to Backend::LoadCookiesForKey, which posts
-// Backend::LoadKeyAndNotifyOnDBThread to the BG runner. That routine loads just
-// that single domain key (eTLD+1)'s cookies, and posts a Backend::
-// CompleteLoadForKeyOnIOThread to the client runner to notify the caller of
-// SQLitePersistentCookieStore::LoadCookiesForKey that that load is complete.
-//
-// Subsequent to loading, mutations may be queued by any thread using
-// AddCookie, UpdateCookieAccessTime, and DeleteCookie. These are flushed to
-// disk on the BG runner every 30 seconds, 512 operations, or call to Flush(),
-// whichever occurs first.
-class SQLitePersistentCookieStore::Backend
-    : public base::RefCountedThreadSafe<SQLitePersistentCookieStore::Backend> {
- public:
-  Backend(
-      const base::FilePath& path,
-      const scoped_refptr<base::SequencedTaskRunner>& client_task_runner,
-      const scoped_refptr<base::SequencedTaskRunner>& background_task_runner,
-      bool restore_old_session_cookies,
-      CookieCryptoDelegate* crypto_delegate)
-      : path_(path),
-        num_pending_(0),
-        initialized_(false),
-        corruption_detected_(false),
-        restore_old_session_cookies_(restore_old_session_cookies),
-        num_cookies_read_(0),
-        client_task_runner_(client_task_runner),
-        background_task_runner_(background_task_runner),
-        num_priority_waiting_(0),
-        total_priority_requests_(0),
-        crypto_(crypto_delegate) {}
-
-  // Creates or loads the SQLite database.
-  void Load(const LoadedCallback& loaded_callback);
-
-  // Loads cookies for the domain key (eTLD+1).
-  void LoadCookiesForKey(const std::string& domain,
-                         const LoadedCallback& loaded_callback);
-
-  // Steps through all results of |smt|, makes a cookie from each, and adds the
-  // cookie to |cookies|. This method also updates |num_cookies_read_|.
-  void MakeCookiesFromSQLStatement(std::vector<CanonicalCookie*>* cookies,
-                                   sql::Statement* statement);
-
-  // Batch a cookie addition.
-  void AddCookie(const CanonicalCookie& cc);
-
-  // Batch a cookie access time update.
-  void UpdateCookieAccessTime(const CanonicalCookie& cc);
-
-  // Batch a cookie deletion.
-  void DeleteCookie(const CanonicalCookie& cc);
-
-  // Commit pending operations as soon as possible.
-  void Flush(const base::Closure& callback);
-
-  // Commit any pending operations and close the database.  This must be called
-  // before the object is destructed.
-  void Close();
-
-  // Post background delete of all cookies that match |cookies|.
-  void DeleteAllInList(const std::list<CookieOrigin>& cookies);
-
- private:
-  friend class base::RefCountedThreadSafe<SQLitePersistentCookieStore::Backend>;
-
-  // You should call Close() before destructing this object.
-  ~Backend() {
-    DCHECK(!db_.get()) << "Close should have already been called.";
-    DCHECK_EQ(0u, num_pending_);
-    DCHECK(pending_.empty());
-
-    for (CanonicalCookie* cookie : cookies_) {
-      delete cookie;
-    }
-  }
-
-  // Database upgrade statements.
-  bool EnsureDatabaseVersion();
-
-  class PendingOperation {
-   public:
-    enum OperationType {
-      COOKIE_ADD,
-      COOKIE_UPDATEACCESS,
-      COOKIE_DELETE,
-    };
-
-    PendingOperation(OperationType op, const CanonicalCookie& cc)
-        : op_(op), cc_(cc) {}
-
-    OperationType op() const { return op_; }
-    const CanonicalCookie& cc() const { return cc_; }
-
-   private:
-    OperationType op_;
-    CanonicalCookie cc_;
-  };
-
- private:
-  // Creates or loads the SQLite database on background runner.
-  void LoadAndNotifyInBackground(const LoadedCallback& loaded_callback,
-                                 const base::Time& posted_at);
-
-  // Loads cookies for the domain key (eTLD+1) on background runner.
-  void LoadKeyAndNotifyInBackground(const std::string& domains,
-                                    const LoadedCallback& loaded_callback,
-                                    const base::Time& posted_at);
-
-  // Notifies the CookieMonster when loading completes for a specific domain key
-  // or for all domain keys. Triggers the callback and passes it all cookies
-  // that have been loaded from DB since last IO notification.
-  void Notify(const LoadedCallback& loaded_callback, bool load_success);
-
-  // Sends notification when the entire store is loaded, and reports metrics
-  // for the total time to load and aggregated results from any priority loads
-  // that occurred.
-  void CompleteLoadInForeground(const LoadedCallback& loaded_callback,
-                                bool load_success);
-
-  // Sends notification when a single priority load completes. Updates priority
-  // load metric data. The data is sent only after the final load completes.
-  void CompleteLoadForKeyInForeground(const LoadedCallback& loaded_callback,
-                                      bool load_success,
-                                      const base::Time& requested_at);
-
-  // Sends all metrics, including posting a ReportMetricsInBackground task.
-  // Called after all priority and regular loading is complete.
-  void ReportMetrics();
-
-  // Sends background-runner owned metrics (i.e., the combined duration of all
-  // BG-runner tasks).
-  void ReportMetricsInBackground();
-
-  // Initialize the data base.
-  bool InitializeDatabase();
-
-  // Loads cookies for the next domain key from the DB, then either reschedules
-  // itself or schedules the provided callback to run on the client runner (if
-  // all domains are loaded).
-  void ChainLoadCookies(const LoadedCallback& loaded_callback);
-
-  // Load all cookies for a set of domains/hosts
-  bool LoadCookiesForDomains(const std::set<std::string>& key);
-
-  // Batch a cookie operation (add or delete)
-  void BatchOperation(PendingOperation::OperationType op,
-                      const CanonicalCookie& cc);
-  // Commit our pending operations to the database.
-  void Commit();
-  // Close() executed on the background runner.
-  void InternalBackgroundClose();
-
-  void DeleteSessionCookiesOnStartup();
-
-  void BackgroundDeleteAllInList(const std::list<CookieOrigin>& cookies);
-
-  void DatabaseErrorCallback(int error, sql::Statement* stmt);
-  void KillDatabase();
-
-  void PostBackgroundTask(const tracked_objects::Location& origin,
-                          const base::Closure& task);
-  void PostClientTask(const tracked_objects::Location& origin,
-                      const base::Closure& task);
-
-  // Shared code between the different load strategies to be used after all
-  // cookies have been loaded.
-  void FinishedLoadingCookies(const LoadedCallback& loaded_callback,
-                              bool success);
-
-  const base::FilePath path_;
-  scoped_ptr<sql::Connection> db_;
-  sql::MetaTable meta_table_;
-
-  typedef std::list<PendingOperation*> PendingOperationsList;
-  PendingOperationsList pending_;
-  PendingOperationsList::size_type num_pending_;
-  // Guard |cookies_|, |pending_|, |num_pending_|.
-  base::Lock lock_;
-
-  // Temporary buffer for cookies loaded from DB. Accumulates cookies to reduce
-  // the number of messages sent to the client runner. Sent back in response to
-  // individual load requests for domain keys or when all loading completes.
-  // Ownership of the cookies in this vector is transferred to the client in
-  // response to individual load requests or when all loading completes.
-  std::vector<CanonicalCookie*> cookies_;
-
-  // Map of domain keys(eTLD+1) to domains/hosts that are to be loaded from DB.
-  std::map<std::string, std::set<std::string>> keys_to_load_;
-
-  // Indicates if DB has been initialized.
-  bool initialized_;
-
-  // Indicates if the kill-database callback has been scheduled.
-  bool corruption_detected_;
-
-  // If false, we should filter out session cookies when reading the DB.
-  bool restore_old_session_cookies_;
-
-  // The cumulative time spent loading the cookies on the background runner.
-  // Incremented and reported from the background runner.
-  base::TimeDelta cookie_load_duration_;
-
-  // The total number of cookies read. Incremented and reported on the
-  // background runner.
-  int num_cookies_read_;
-
-  scoped_refptr<base::SequencedTaskRunner> client_task_runner_;
-  scoped_refptr<base::SequencedTaskRunner> background_task_runner_;
-
-  // Guards the following metrics-related properties (only accessed when
-  // starting/completing priority loads or completing the total load).
-  base::Lock metrics_lock_;
-  int num_priority_waiting_;
-  // The total number of priority requests.
-  int total_priority_requests_;
-  // The time when |num_priority_waiting_| incremented to 1.
-  base::Time current_priority_wait_start_;
-  // The cumulative duration of time when |num_priority_waiting_| was greater
-  // than 1.
-  base::TimeDelta priority_wait_duration_;
-  // Class with functions that do cryptographic operations (for protecting
-  // cookies stored persistently).
-  //
-  // Not owned.
-  CookieCryptoDelegate* crypto_;
-
-  DISALLOW_COPY_AND_ASSIGN(Backend);
-};
-
-namespace {
-
-// Version number of the database.
-//
-// Version 9 adds a partial index to track non-persistent cookies.
-// Non-persistent cookies sometimes need to be deleted on startup. There are
-// frequently few or no non-persistent cookies, so the partial index allows the
-// deletion to be sped up or skipped, without having to page in the DB.
-//
-// Version 8 adds "first-party only" cookies.
-//
-// Version 7 adds encrypted values.  Old values will continue to be used but
-// all new values written will be encrypted on selected operating systems.  New
-// records read by old clients will simply get an empty cookie value while old
-// records read by new clients will continue to operate with the unencrypted
-// version.  New and old clients alike will always write/update records with
-// what they support.
-//
-// Version 6 adds cookie priorities. This allows developers to influence the
-// order in which cookies are evicted in order to meet domain cookie limits.
-//
-// Version 5 adds the columns has_expires and is_persistent, so that the
-// database can store session cookies as well as persistent cookies. Databases
-// of version 5 are incompatible with older versions of code. If a database of
-// version 5 is read by older code, session cookies will be treated as normal
-// cookies. Currently, these fields are written, but not read anymore.
-//
-// In version 4, we migrated the time epoch.  If you open the DB with an older
-// version on Mac or Linux, the times will look wonky, but the file will likely
-// be usable. On Windows version 3 and 4 are the same.
-//
-// Version 3 updated the database to include the last access time, so we can
-// expire them in decreasing order of use when we've reached the maximum
-// number of cookies.
-const int kCurrentVersionNumber = 9;
-const int kCompatibleVersionNumber = 5;
-
-// Possible values for the 'priority' column.
-enum DBCookiePriority {
-  kCookiePriorityLow = 0,
-  kCookiePriorityMedium = 1,
-  kCookiePriorityHigh = 2,
-};
-
-DBCookiePriority CookiePriorityToDBCookiePriority(CookiePriority value) {
-  switch (value) {
-    case COOKIE_PRIORITY_LOW:
-      return kCookiePriorityLow;
-    case COOKIE_PRIORITY_MEDIUM:
-      return kCookiePriorityMedium;
-    case COOKIE_PRIORITY_HIGH:
-      return kCookiePriorityHigh;
-  }
-
-  NOTREACHED();
-  return kCookiePriorityMedium;
-}
-
-CookiePriority DBCookiePriorityToCookiePriority(DBCookiePriority value) {
-  switch (value) {
-    case kCookiePriorityLow:
-      return COOKIE_PRIORITY_LOW;
-    case kCookiePriorityMedium:
-      return COOKIE_PRIORITY_MEDIUM;
-    case kCookiePriorityHigh:
-      return COOKIE_PRIORITY_HIGH;
-  }
-
-  NOTREACHED();
-  return COOKIE_PRIORITY_DEFAULT;
-}
-
-// Increments a specified TimeDelta by the duration between this object's
-// constructor and destructor. Not thread safe. Multiple instances may be
-// created with the same delta instance as long as their lifetimes are nested.
-// The shortest lived instances have no impact.
-class IncrementTimeDelta {
- public:
-  explicit IncrementTimeDelta(base::TimeDelta* delta)
-      : delta_(delta), original_value_(*delta), start_(base::Time::Now()) {}
-
-  ~IncrementTimeDelta() {
-    *delta_ = original_value_ + base::Time::Now() - start_;
-  }
-
- private:
-  base::TimeDelta* delta_;
-  base::TimeDelta original_value_;
-  base::Time start_;
-
-  DISALLOW_COPY_AND_ASSIGN(IncrementTimeDelta);
-};
-
-// Initializes the cookies table, returning true on success.
-bool InitTable(sql::Connection* db) {
-  if (db->DoesTableExist("cookies"))
-    return true;
-
-  std::string stmt(base::StringPrintf(
-      "CREATE TABLE cookies ("
-      "creation_utc INTEGER NOT NULL UNIQUE PRIMARY KEY,"
-      "host_key TEXT NOT NULL,"
-      "name TEXT NOT NULL,"
-      "value TEXT NOT NULL,"
-      "path TEXT NOT NULL,"
-      "expires_utc INTEGER NOT NULL,"
-      "secure INTEGER NOT NULL,"
-      "httponly INTEGER NOT NULL,"
-      "last_access_utc INTEGER NOT NULL, "
-      "has_expires INTEGER NOT NULL DEFAULT 1, "
-      "persistent INTEGER NOT NULL DEFAULT 1,"
-      "priority INTEGER NOT NULL DEFAULT %d,"
-      "encrypted_value BLOB DEFAULT '',"
-      "firstpartyonly INTEGER NOT NULL DEFAULT 0)",
-      CookiePriorityToDBCookiePriority(COOKIE_PRIORITY_DEFAULT)));
-  if (!db->Execute(stmt.c_str()))
-    return false;
-
-  if (!db->Execute("CREATE INDEX domain ON cookies(host_key)"))
-    return false;
-
-#if defined(OS_IOS)
-  // iOS 8.1 and older doesn't support partial indices. iOS 8.2 supports
-  // partial indices.
-  if (!db->Execute("CREATE INDEX is_transient ON cookies(persistent)")) {
-#else
-  if (!db->Execute(
-          "CREATE INDEX is_transient ON cookies(persistent) "
-          "where persistent != 1")) {
-#endif
-    return false;
-  }
-
-  return true;
-}
-
-}  // namespace
-
-void SQLitePersistentCookieStore::Backend::Load(
-    const LoadedCallback& loaded_callback) {
-  PostBackgroundTask(FROM_HERE,
-                     base::Bind(&Backend::LoadAndNotifyInBackground, this,
-                                loaded_callback, base::Time::Now()));
-}
-
-void SQLitePersistentCookieStore::Backend::LoadCookiesForKey(
-    const std::string& key,
-    const LoadedCallback& loaded_callback) {
-  {
-    base::AutoLock locked(metrics_lock_);
-    if (num_priority_waiting_ == 0)
-      current_priority_wait_start_ = base::Time::Now();
-    num_priority_waiting_++;
-    total_priority_requests_++;
-  }
-
-  PostBackgroundTask(
-      FROM_HERE, base::Bind(&Backend::LoadKeyAndNotifyInBackground, this, key,
-                            loaded_callback, base::Time::Now()));
-}
-
-void SQLitePersistentCookieStore::Backend::LoadAndNotifyInBackground(
-    const LoadedCallback& loaded_callback,
-    const base::Time& posted_at) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-  IncrementTimeDelta increment(&cookie_load_duration_);
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeLoadDBQueueWait",
-                             base::Time::Now() - posted_at,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  if (!InitializeDatabase()) {
-    PostClientTask(FROM_HERE, base::Bind(&Backend::CompleteLoadInForeground,
-                                         this, loaded_callback, false));
-  } else {
-    ChainLoadCookies(loaded_callback);
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::LoadKeyAndNotifyInBackground(
-    const std::string& key,
-    const LoadedCallback& loaded_callback,
-    const base::Time& posted_at) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-  IncrementTimeDelta increment(&cookie_load_duration_);
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeKeyLoadDBQueueWait",
-                             base::Time::Now() - posted_at,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  bool success = false;
-  if (InitializeDatabase()) {
-    std::map<std::string, std::set<std::string>>::iterator it =
-        keys_to_load_.find(key);
-    if (it != keys_to_load_.end()) {
-      success = LoadCookiesForDomains(it->second);
-      keys_to_load_.erase(it);
-    } else {
-      success = true;
-    }
-  }
-
-  PostClientTask(
-      FROM_HERE,
-      base::Bind(
-          &SQLitePersistentCookieStore::Backend::CompleteLoadForKeyInForeground,
-          this, loaded_callback, success, posted_at));
-}
-
-void SQLitePersistentCookieStore::Backend::CompleteLoadForKeyInForeground(
-    const LoadedCallback& loaded_callback,
-    bool load_success,
-    const ::Time& requested_at) {
-  DCHECK(client_task_runner_->RunsTasksOnCurrentThread());
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeKeyLoadTotalWait",
-                             base::Time::Now() - requested_at,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  Notify(loaded_callback, load_success);
-
-  {
-    base::AutoLock locked(metrics_lock_);
-    num_priority_waiting_--;
-    if (num_priority_waiting_ == 0) {
-      priority_wait_duration_ +=
-          base::Time::Now() - current_priority_wait_start_;
-    }
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::ReportMetricsInBackground() {
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeLoad", cookie_load_duration_,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-}
-
-void SQLitePersistentCookieStore::Backend::ReportMetrics() {
-  PostBackgroundTask(
-      FROM_HERE,
-      base::Bind(
-          &SQLitePersistentCookieStore::Backend::ReportMetricsInBackground,
-          this));
-
-  {
-    base::AutoLock locked(metrics_lock_);
-    UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.PriorityBlockingTime",
-                               priority_wait_duration_,
-                               base::TimeDelta::FromMilliseconds(1),
-                               base::TimeDelta::FromMinutes(1), 50);
-
-    UMA_HISTOGRAM_COUNTS_100("Cookie.PriorityLoadCount",
-                             total_priority_requests_);
-
-    UMA_HISTOGRAM_COUNTS_10000("Cookie.NumberOfLoadedCookies",
-                               num_cookies_read_);
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::CompleteLoadInForeground(
-    const LoadedCallback& loaded_callback,
-    bool load_success) {
-  Notify(loaded_callback, load_success);
-
-  if (load_success)
-    ReportMetrics();
-}
-
-void SQLitePersistentCookieStore::Backend::Notify(
-    const LoadedCallback& loaded_callback,
-    bool load_success) {
-  DCHECK(client_task_runner_->RunsTasksOnCurrentThread());
-
-  std::vector<CanonicalCookie*> cookies;
-  {
-    base::AutoLock locked(lock_);
-    cookies.swap(cookies_);
-  }
-
-  loaded_callback.Run(cookies);
-}
-
-bool SQLitePersistentCookieStore::Backend::InitializeDatabase() {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  if (initialized_ || corruption_detected_) {
-    // Return false if we were previously initialized but the DB has since been
-    // closed, or if corruption caused a database reset during initialization.
-    return db_ != NULL;
-  }
-
-  base::Time start = base::Time::Now();
-
-  const base::FilePath dir = path_.DirName();
-  if (!base::PathExists(dir) && !base::CreateDirectory(dir)) {
-    return false;
-  }
-
-  int64 db_size = 0;
-  if (base::GetFileSize(path_, &db_size))
-    UMA_HISTOGRAM_COUNTS("Cookie.DBSizeInKB", db_size / 1024);
-
-  db_.reset(new sql::Connection);
-  db_->set_histogram_tag("Cookie");
-
-  // Unretained to avoid a ref loop with |db_|.
-  db_->set_error_callback(
-      base::Bind(&SQLitePersistentCookieStore::Backend::DatabaseErrorCallback,
-                 base::Unretained(this)));
-
-  if (!db_->Open(path_)) {
-    NOTREACHED() << "Unable to open cookie DB.";
-    if (corruption_detected_)
-      db_->Raze();
-    meta_table_.Reset();
-    db_.reset();
-    return false;
-  }
-
-  if (!EnsureDatabaseVersion() || !InitTable(db_.get())) {
-    NOTREACHED() << "Unable to open cookie DB.";
-    if (corruption_detected_)
-      db_->Raze();
-    meta_table_.Reset();
-    db_.reset();
-    return false;
-  }
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeInitializeDB",
-                             base::Time::Now() - start,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  start = base::Time::Now();
-
-  // Retrieve all the domains
-  sql::Statement smt(
-      db_->GetUniqueStatement("SELECT DISTINCT host_key FROM cookies"));
-
-  if (!smt.is_valid()) {
-    if (corruption_detected_)
-      db_->Raze();
-    meta_table_.Reset();
-    db_.reset();
-    return false;
-  }
-
-  std::vector<std::string> host_keys;
-  while (smt.Step())
-    host_keys.push_back(smt.ColumnString(0));
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeLoadDomains",
-                             base::Time::Now() - start,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  base::Time start_parse = base::Time::Now();
-
-  // Build a map of domain keys (always eTLD+1) to domains.
-  for (size_t idx = 0; idx < host_keys.size(); ++idx) {
-    const std::string& domain = host_keys[idx];
-    std::string key = registry_controlled_domains::GetDomainAndRegistry(
-        domain, registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
-
-    keys_to_load_[key].insert(domain);
-  }
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeParseDomains",
-                             base::Time::Now() - start_parse,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  UMA_HISTOGRAM_CUSTOM_TIMES("Cookie.TimeInitializeDomainMap",
-                             base::Time::Now() - start,
-                             base::TimeDelta::FromMilliseconds(1),
-                             base::TimeDelta::FromMinutes(1), 50);
-
-  initialized_ = true;
-
-  if (!restore_old_session_cookies_)
-    DeleteSessionCookiesOnStartup();
-  return true;
-}
-
-void SQLitePersistentCookieStore::Backend::ChainLoadCookies(
-    const LoadedCallback& loaded_callback) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-  IncrementTimeDelta increment(&cookie_load_duration_);
-
-  bool load_success = true;
-
-  if (!db_) {
-    // Close() has been called on this store.
-    load_success = false;
-  } else if (keys_to_load_.size() > 0) {
-    // Load cookies for the first domain key.
-    std::map<std::string, std::set<std::string>>::iterator it =
-        keys_to_load_.begin();
-    load_success = LoadCookiesForDomains(it->second);
-    keys_to_load_.erase(it);
-  }
-
-  // If load is successful and there are more domain keys to be loaded,
-  // then post a background task to continue chain-load;
-  // Otherwise notify on client runner.
-  if (load_success && keys_to_load_.size() > 0) {
-    bool success = background_task_runner_->PostDelayedTask(
-        FROM_HERE,
-        base::Bind(&Backend::ChainLoadCookies, this, loaded_callback),
-        base::TimeDelta::FromMilliseconds(kLoadDelayMilliseconds));
-    if (!success) {
-      LOG(WARNING) << "Failed to post task from " << FROM_HERE.ToString()
-                   << " to background_task_runner_.";
-    }
-  } else {
-    FinishedLoadingCookies(loaded_callback, load_success);
-  }
-}
-
-bool SQLitePersistentCookieStore::Backend::LoadCookiesForDomains(
-    const std::set<std::string>& domains) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  sql::Statement smt;
-  if (restore_old_session_cookies_) {
-    smt.Assign(db_->GetCachedStatement(
-        SQL_FROM_HERE,
-        "SELECT creation_utc, host_key, name, value, encrypted_value, path, "
-        "expires_utc, secure, httponly, firstpartyonly, last_access_utc, "
-        "has_expires, persistent, priority FROM cookies WHERE host_key = ?"));
-  } else {
-    smt.Assign(db_->GetCachedStatement(
-        SQL_FROM_HERE,
-        "SELECT creation_utc, host_key, name, value, encrypted_value, path, "
-        "expires_utc, secure, httponly, firstpartyonly, last_access_utc, "
-        "has_expires, persistent, priority FROM cookies WHERE host_key = ? "
-        "AND persistent = 1"));
-  }
-  if (!smt.is_valid()) {
-    smt.Clear();  // Disconnect smt_ref from db_.
-    meta_table_.Reset();
-    db_.reset();
-    return false;
-  }
-
-  std::vector<CanonicalCookie*> cookies;
-  std::set<std::string>::const_iterator it = domains.begin();
-  for (; it != domains.end(); ++it) {
-    smt.BindString(0, *it);
-    MakeCookiesFromSQLStatement(&cookies, &smt);
-    smt.Reset(true);
-  }
-  {
-    base::AutoLock locked(lock_);
-    cookies_.insert(cookies_.end(), cookies.begin(), cookies.end());
-  }
-  return true;
-}
-
-void SQLitePersistentCookieStore::Backend::MakeCookiesFromSQLStatement(
-    std::vector<CanonicalCookie*>* cookies,
-    sql::Statement* statement) {
-  sql::Statement& smt = *statement;
-  while (smt.Step()) {
-    std::string value;
-    std::string encrypted_value = smt.ColumnString(4);
-    if (!encrypted_value.empty() && crypto_) {
-      crypto_->DecryptString(encrypted_value, &value);
-    } else {
-      DCHECK(encrypted_value.empty());
-      value = smt.ColumnString(3);
-    }
-    scoped_ptr<CanonicalCookie> cc(new CanonicalCookie(
-        // The "source" URL is not used with persisted cookies.
-        GURL(),                                        // Source
-        smt.ColumnString(2),                           // name
-        value,                                         // value
-        smt.ColumnString(1),                           // domain
-        smt.ColumnString(5),                           // path
-        Time::FromInternalValue(smt.ColumnInt64(0)),   // creation_utc
-        Time::FromInternalValue(smt.ColumnInt64(6)),   // expires_utc
-        Time::FromInternalValue(smt.ColumnInt64(10)),  // last_access_utc
-        smt.ColumnInt(7) != 0,                         // secure
-        smt.ColumnInt(8) != 0,                         // httponly
-        smt.ColumnInt(9) != 0,                         // firstpartyonly
-        DBCookiePriorityToCookiePriority(
-            static_cast<DBCookiePriority>(smt.ColumnInt(13)))));  // priority
-    DLOG_IF(WARNING, cc->CreationDate() > Time::Now())
-        << L"CreationDate too recent";
-    cookies->push_back(cc.release());
-    ++num_cookies_read_;
-  }
-}
-
-bool SQLitePersistentCookieStore::Backend::EnsureDatabaseVersion() {
-  // Version check.
-  if (!meta_table_.Init(db_.get(), kCurrentVersionNumber,
-                        kCompatibleVersionNumber)) {
-    return false;
-  }
-
-  if (meta_table_.GetCompatibleVersionNumber() > kCurrentVersionNumber) {
-    LOG(WARNING) << "Cookie database is too new.";
-    return false;
-  }
-
-  int cur_version = meta_table_.GetVersionNumber();
-  if (cur_version == 2) {
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-    if (!db_->Execute(
-            "ALTER TABLE cookies ADD COLUMN last_access_utc "
-            "INTEGER DEFAULT 0") ||
-        !db_->Execute("UPDATE cookies SET last_access_utc = creation_utc")) {
-      LOG(WARNING) << "Unable to update cookie database to version 3.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-  }
-
-  if (cur_version == 3) {
-    // The time epoch changed for Mac & Linux in this version to match Windows.
-    // This patch came after the main epoch change happened, so some
-    // developers have "good" times for cookies added by the more recent
-    // versions. So we have to be careful to only update times that are under
-    // the old system (which will appear to be from before 1970 in the new
-    // system). The magic number used below is 1970 in our time units.
-    sql::Transaction transaction(db_.get());
-    transaction.Begin();
-#if !defined(OS_WIN)
-    ignore_result(db_->Execute(
-        "UPDATE cookies "
-        "SET creation_utc = creation_utc + 11644473600000000 "
-        "WHERE rowid IN "
-        "(SELECT rowid FROM cookies WHERE "
-        "creation_utc > 0 AND creation_utc < 11644473600000000)"));
-    ignore_result(db_->Execute(
-        "UPDATE cookies "
-        "SET expires_utc = expires_utc + 11644473600000000 "
-        "WHERE rowid IN "
-        "(SELECT rowid FROM cookies WHERE "
-        "expires_utc > 0 AND expires_utc < 11644473600000000)"));
-    ignore_result(db_->Execute(
-        "UPDATE cookies "
-        "SET last_access_utc = last_access_utc + 11644473600000000 "
-        "WHERE rowid IN "
-        "(SELECT rowid FROM cookies WHERE "
-        "last_access_utc > 0 AND last_access_utc < 11644473600000000)"));
-#endif
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    transaction.Commit();
-  }
-
-  if (cur_version == 4) {
-    const base::TimeTicks start_time = base::TimeTicks::Now();
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-    if (!db_->Execute(
-            "ALTER TABLE cookies "
-            "ADD COLUMN has_expires INTEGER DEFAULT 1") ||
-        !db_->Execute(
-            "ALTER TABLE cookies "
-            "ADD COLUMN persistent INTEGER DEFAULT 1")) {
-      LOG(WARNING) << "Unable to update cookie database to version 5.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-    UMA_HISTOGRAM_TIMES("Cookie.TimeDatabaseMigrationToV5",
-                        base::TimeTicks::Now() - start_time);
-  }
-
-  if (cur_version == 5) {
-    const base::TimeTicks start_time = base::TimeTicks::Now();
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-    // Alter the table to add the priority column with a default value.
-    std::string stmt(base::StringPrintf(
-        "ALTER TABLE cookies ADD COLUMN priority INTEGER DEFAULT %d",
-        CookiePriorityToDBCookiePriority(COOKIE_PRIORITY_DEFAULT)));
-    if (!db_->Execute(stmt.c_str())) {
-      LOG(WARNING) << "Unable to update cookie database to version 6.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-    UMA_HISTOGRAM_TIMES("Cookie.TimeDatabaseMigrationToV6",
-                        base::TimeTicks::Now() - start_time);
-  }
-
-  if (cur_version == 6) {
-    const base::TimeTicks start_time = base::TimeTicks::Now();
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-    // Alter the table to add empty "encrypted value" column.
-    if (!db_->Execute(
-            "ALTER TABLE cookies "
-            "ADD COLUMN encrypted_value BLOB DEFAULT ''")) {
-      LOG(WARNING) << "Unable to update cookie database to version 7.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-    UMA_HISTOGRAM_TIMES("Cookie.TimeDatabaseMigrationToV7",
-                        base::TimeTicks::Now() - start_time);
-  }
-
-  if (cur_version == 7) {
-    const base::TimeTicks start_time = base::TimeTicks::Now();
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-    // Alter the table to add a 'firstpartyonly' column.
-    if (!db_->Execute(
-            "ALTER TABLE cookies "
-            "ADD COLUMN firstpartyonly INTEGER DEFAULT 0")) {
-      LOG(WARNING) << "Unable to update cookie database to version 8.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-    UMA_HISTOGRAM_TIMES("Cookie.TimeDatabaseMigrationToV8",
-                        base::TimeTicks::Now() - start_time);
-  }
-
-  if (cur_version == 8) {
-    const base::TimeTicks start_time = base::TimeTicks::Now();
-    sql::Transaction transaction(db_.get());
-    if (!transaction.Begin())
-      return false;
-
-    if (!db_->Execute("DROP INDEX IF EXISTS cookie_times")) {
-      LOG(WARNING)
-          << "Unable to drop table cookie_times in update to version 9.";
-      return false;
-    }
-
-    if (!db_->Execute(
-            "CREATE INDEX IF NOT EXISTS domain ON cookies(host_key)")) {
-      LOG(WARNING) << "Unable to create index domain in update to version 9.";
-      return false;
-    }
-
-#if defined(OS_IOS)
-    // iOS 8.1 and older doesn't support partial indices. iOS 8.2 supports
-    // partial indices.
-    if (!db_->Execute(
-            "CREATE INDEX IF NOT EXISTS is_transient ON cookies(persistent)")) {
-#else
-    if (!db_->Execute(
-            "CREATE INDEX IF NOT EXISTS is_transient ON cookies(persistent) "
-            "where persistent != 1")) {
-#endif
-      LOG(WARNING)
-          << "Unable to create index is_transient in update to version 9.";
-      return false;
-    }
-    ++cur_version;
-    meta_table_.SetVersionNumber(cur_version);
-    meta_table_.SetCompatibleVersionNumber(
-        std::min(cur_version, kCompatibleVersionNumber));
-    transaction.Commit();
-    UMA_HISTOGRAM_TIMES("Cookie.TimeDatabaseMigrationToV9",
-                        base::TimeTicks::Now() - start_time);
-  }
-
-  // Put future migration cases here.
-
-  if (cur_version < kCurrentVersionNumber) {
-    UMA_HISTOGRAM_COUNTS_100("Cookie.CorruptMetaTable", 1);
-
-    meta_table_.Reset();
-    db_.reset(new sql::Connection);
-    if (!sql::Connection::Delete(path_) || !db_->Open(path_) ||
-        !meta_table_.Init(db_.get(), kCurrentVersionNumber,
-                          kCompatibleVersionNumber)) {
-      UMA_HISTOGRAM_COUNTS_100("Cookie.CorruptMetaTableRecoveryFailed", 1);
-      NOTREACHED() << "Unable to reset the cookie DB.";
-      meta_table_.Reset();
-      db_.reset();
-      return false;
-    }
-  }
-
-  return true;
-}
-
-void SQLitePersistentCookieStore::Backend::AddCookie(
-    const CanonicalCookie& cc) {
-  BatchOperation(PendingOperation::COOKIE_ADD, cc);
-}
-
-void SQLitePersistentCookieStore::Backend::UpdateCookieAccessTime(
-    const CanonicalCookie& cc) {
-  BatchOperation(PendingOperation::COOKIE_UPDATEACCESS, cc);
-}
-
-void SQLitePersistentCookieStore::Backend::DeleteCookie(
-    const CanonicalCookie& cc) {
-  BatchOperation(PendingOperation::COOKIE_DELETE, cc);
-}
-
-void SQLitePersistentCookieStore::Backend::BatchOperation(
-    PendingOperation::OperationType op,
-    const CanonicalCookie& cc) {
-  // Commit every 30 seconds.
-  static const int kCommitIntervalMs = 30 * 1000;
-  // Commit right away if we have more than 512 outstanding operations.
-  static const size_t kCommitAfterBatchSize = 512;
-  DCHECK(!background_task_runner_->RunsTasksOnCurrentThread());
-
-  // We do a full copy of the cookie here, and hopefully just here.
-  scoped_ptr<PendingOperation> po(new PendingOperation(op, cc));
-
-  PendingOperationsList::size_type num_pending;
-  {
-    base::AutoLock locked(lock_);
-    pending_.push_back(po.release());
-    num_pending = ++num_pending_;
-  }
-
-  if (num_pending == 1) {
-    // We've gotten our first entry for this batch, fire off the timer.
-    if (!background_task_runner_->PostDelayedTask(
-            FROM_HERE, base::Bind(&Backend::Commit, this),
-            base::TimeDelta::FromMilliseconds(kCommitIntervalMs))) {
-      NOTREACHED() << "background_task_runner_ is not running.";
-    }
-  } else if (num_pending == kCommitAfterBatchSize) {
-    // We've reached a big enough batch, fire off a commit now.
-    PostBackgroundTask(FROM_HERE, base::Bind(&Backend::Commit, this));
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::Commit() {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  PendingOperationsList ops;
-  {
-    base::AutoLock locked(lock_);
-    pending_.swap(ops);
-    num_pending_ = 0;
-  }
-
-  // Maybe an old timer fired or we are already Close()'ed.
-  if (!db_.get() || ops.empty())
-    return;
-
-  sql::Statement add_smt(db_->GetCachedStatement(
-      SQL_FROM_HERE,
-      "INSERT INTO cookies (creation_utc, host_key, name, value, "
-      "encrypted_value, path, expires_utc, secure, httponly, firstpartyonly, "
-      "last_access_utc, has_expires, persistent, priority) "
-      "VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?)"));
-  if (!add_smt.is_valid())
-    return;
-
-  sql::Statement update_access_smt(db_->GetCachedStatement(
-      SQL_FROM_HERE,
-      "UPDATE cookies SET last_access_utc=? WHERE creation_utc=?"));
-  if (!update_access_smt.is_valid())
-    return;
-
-  sql::Statement del_smt(db_->GetCachedStatement(
-      SQL_FROM_HERE, "DELETE FROM cookies WHERE creation_utc=?"));
-  if (!del_smt.is_valid())
-    return;
-
-  sql::Transaction transaction(db_.get());
-  if (!transaction.Begin())
-    return;
-
-  for (PendingOperationsList::iterator it = ops.begin(); it != ops.end();
-       ++it) {
-    // Free the cookies as we commit them to the database.
-    scoped_ptr<PendingOperation> po(*it);
-    switch (po->op()) {
-      case PendingOperation::COOKIE_ADD:
-        add_smt.Reset(true);
-        add_smt.BindInt64(0, po->cc().CreationDate().ToInternalValue());
-        add_smt.BindString(1, po->cc().Domain());
-        add_smt.BindString(2, po->cc().Name());
-        if (crypto_) {
-          std::string encrypted_value;
-          add_smt.BindCString(3, "");  // value
-          crypto_->EncryptString(po->cc().Value(), &encrypted_value);
-          // BindBlob() immediately makes an internal copy of the data.
-          add_smt.BindBlob(4, encrypted_value.data(),
-                           static_cast<int>(encrypted_value.length()));
-        } else {
-          add_smt.BindString(3, po->cc().Value());
-          add_smt.BindBlob(4, "", 0);  // encrypted_value
-        }
-        add_smt.BindString(5, po->cc().Path());
-        add_smt.BindInt64(6, po->cc().ExpiryDate().ToInternalValue());
-        add_smt.BindInt(7, po->cc().IsSecure());
-        add_smt.BindInt(8, po->cc().IsHttpOnly());
-        add_smt.BindInt(9, po->cc().IsFirstPartyOnly());
-        add_smt.BindInt64(10, po->cc().LastAccessDate().ToInternalValue());
-        add_smt.BindInt(11, po->cc().IsPersistent());
-        add_smt.BindInt(12, po->cc().IsPersistent());
-        add_smt.BindInt(13,
-                        CookiePriorityToDBCookiePriority(po->cc().Priority()));
-        if (!add_smt.Run())
-          NOTREACHED() << "Could not add a cookie to the DB.";
-        break;
-
-      case PendingOperation::COOKIE_UPDATEACCESS:
-        update_access_smt.Reset(true);
-        update_access_smt.BindInt64(
-            0, po->cc().LastAccessDate().ToInternalValue());
-        update_access_smt.BindInt64(1,
-                                    po->cc().CreationDate().ToInternalValue());
-        if (!update_access_smt.Run())
-          NOTREACHED() << "Could not update cookie last access time in the DB.";
-        break;
-
-      case PendingOperation::COOKIE_DELETE:
-        del_smt.Reset(true);
-        del_smt.BindInt64(0, po->cc().CreationDate().ToInternalValue());
-        if (!del_smt.Run())
-          NOTREACHED() << "Could not delete a cookie from the DB.";
-        break;
-
-      default:
-        NOTREACHED();
-        break;
-    }
-  }
-  bool succeeded = transaction.Commit();
-  UMA_HISTOGRAM_ENUMERATION("Cookie.BackingStoreUpdateResults",
-                            succeeded ? 0 : 1, 2);
-}
-
-void SQLitePersistentCookieStore::Backend::Flush(
-    const base::Closure& callback) {
-  DCHECK(!background_task_runner_->RunsTasksOnCurrentThread());
-  PostBackgroundTask(FROM_HERE, base::Bind(&Backend::Commit, this));
-
-  if (!callback.is_null()) {
-    // We want the completion task to run immediately after Commit() returns.
-    // Posting it from here means there is less chance of another task getting
-    // onto the message queue first, than if we posted it from Commit() itself.
-    PostBackgroundTask(FROM_HERE, callback);
-  }
-}
-
-// Fire off a close message to the background runner.  We could still have a
-// pending commit timer or Load operations holding references on us, but if/when
-// this fires we will already have been cleaned up and it will be ignored.
-void SQLitePersistentCookieStore::Backend::Close() {
-  if (background_task_runner_->RunsTasksOnCurrentThread()) {
-    InternalBackgroundClose();
-  } else {
-    // Must close the backend on the background runner.
-    PostBackgroundTask(FROM_HERE,
-                       base::Bind(&Backend::InternalBackgroundClose, this));
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::InternalBackgroundClose() {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-  // Commit any pending operations
-  Commit();
-
-  meta_table_.Reset();
-  db_.reset();
-}
-
-void SQLitePersistentCookieStore::Backend::DatabaseErrorCallback(
-    int error,
-    sql::Statement* stmt) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  if (!sql::IsErrorCatastrophic(error))
-    return;
-
-  // TODO(shess): Running KillDatabase() multiple times should be
-  // safe.
-  if (corruption_detected_)
-    return;
-
-  corruption_detected_ = true;
-
-  // Don't just do the close/delete here, as we are being called by |db| and
-  // that seems dangerous.
-  // TODO(shess): Consider just calling RazeAndClose() immediately.
-  // db_ may not be safe to reset at this point, but RazeAndClose()
-  // would cause the stack to unwind safely with errors.
-  PostBackgroundTask(FROM_HERE, base::Bind(&Backend::KillDatabase, this));
-}
-
-void SQLitePersistentCookieStore::Backend::KillDatabase() {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  if (db_) {
-    // This Backend will now be in-memory only. In a future run we will recreate
-    // the database. Hopefully things go better then!
-    bool success = db_->RazeAndClose();
-    UMA_HISTOGRAM_BOOLEAN("Cookie.KillDatabaseResult", success);
-    meta_table_.Reset();
-    db_.reset();
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::DeleteAllInList(
-    const std::list<CookieOrigin>& cookies) {
-  if (cookies.empty())
-    return;
-
-  // Perform deletion on background task runner.
-  background_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&Backend::BackgroundDeleteAllInList, this, cookies));
-}
-
-void SQLitePersistentCookieStore::Backend::DeleteSessionCookiesOnStartup() {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-  base::Time start_time = base::Time::Now();
-  if (!db_->Execute("DELETE FROM cookies WHERE persistent != 1"))
-    LOG(WARNING) << "Unable to delete session cookies.";
-
-  UMA_HISTOGRAM_TIMES("Cookie.Startup.TimeSpentDeletingCookies",
-                      base::Time::Now() - start_time);
-  UMA_HISTOGRAM_COUNTS("Cookie.Startup.NumberOfCookiesDeleted",
-                       db_->GetLastChangeCount());
-}
-
-void SQLitePersistentCookieStore::Backend::BackgroundDeleteAllInList(
-    const std::list<CookieOrigin>& cookies) {
-  DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
-
-  if (!db_)
-    return;
-
-  // Force a commit of any pending writes before issuing deletes.
-  // TODO(rohitrao): Remove the need for this Commit() by instead pruning the
-  // list of pending operations. https://crbug.com/486742.
-  Commit();
-
-  sql::Statement del_smt(db_->GetCachedStatement(
-      SQL_FROM_HERE, "DELETE FROM cookies WHERE host_key=? AND secure=?"));
-  if (!del_smt.is_valid()) {
-    LOG(WARNING) << "Unable to delete cookies on shutdown.";
-    return;
-  }
-
-  sql::Transaction transaction(db_.get());
-  if (!transaction.Begin()) {
-    LOG(WARNING) << "Unable to delete cookies on shutdown.";
-    return;
-  }
-
-  for (const auto& cookie : cookies) {
-    const GURL url(cookie_util::CookieOriginToURL(cookie.first, cookie.second));
-    if (!url.is_valid())
-      continue;
-
-    del_smt.Reset(true);
-    del_smt.BindString(0, cookie.first);
-    del_smt.BindInt(1, cookie.second);
-    if (!del_smt.Run())
-      NOTREACHED() << "Could not delete a cookie from the DB.";
-  }
-
-  if (!transaction.Commit())
-    LOG(WARNING) << "Unable to delete cookies on shutdown.";
-}
-
-void SQLitePersistentCookieStore::Backend::PostBackgroundTask(
-    const tracked_objects::Location& origin,
-    const base::Closure& task) {
-  if (!background_task_runner_->PostTask(origin, task)) {
-    LOG(WARNING) << "Failed to post task from " << origin.ToString()
-                 << " to background_task_runner_.";
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::PostClientTask(
-    const tracked_objects::Location& origin,
-    const base::Closure& task) {
-  if (!client_task_runner_->PostTask(origin, task)) {
-    LOG(WARNING) << "Failed to post task from " << origin.ToString()
-                 << " to client_task_runner_.";
-  }
-}
-
-void SQLitePersistentCookieStore::Backend::FinishedLoadingCookies(
-    const LoadedCallback& loaded_callback,
-    bool success) {
-  PostClientTask(FROM_HERE, base::Bind(&Backend::CompleteLoadInForeground, this,
-                                       loaded_callback, success));
-}
-
-SQLitePersistentCookieStore::SQLitePersistentCookieStore(
-    const base::FilePath& path,
-    const scoped_refptr<base::SequencedTaskRunner>& client_task_runner,
-    const scoped_refptr<base::SequencedTaskRunner>& background_task_runner,
-    bool restore_old_session_cookies,
-    CookieCryptoDelegate* crypto_delegate)
-    : backend_(new Backend(path,
-                           client_task_runner,
-                           background_task_runner,
-                           restore_old_session_cookies,
-                           crypto_delegate)) {
-}
-
-void SQLitePersistentCookieStore::DeleteAllInList(
-    const std::list<CookieOrigin>& cookies) {
-  backend_->DeleteAllInList(cookies);
-}
-
-void SQLitePersistentCookieStore::Load(const LoadedCallback& loaded_callback) {
-  backend_->Load(loaded_callback);
-}
-
-void SQLitePersistentCookieStore::LoadCookiesForKey(
-    const std::string& key,
-    const LoadedCallback& loaded_callback) {
-  backend_->LoadCookiesForKey(key, loaded_callback);
-}
-
-void SQLitePersistentCookieStore::AddCookie(const CanonicalCookie& cc) {
-  backend_->AddCookie(cc);
-}
-
-void SQLitePersistentCookieStore::UpdateCookieAccessTime(
-    const CanonicalCookie& cc) {
-  backend_->UpdateCookieAccessTime(cc);
-}
-
-void SQLitePersistentCookieStore::DeleteCookie(const CanonicalCookie& cc) {
-  backend_->DeleteCookie(cc);
-}
-
-void SQLitePersistentCookieStore::SetForceKeepSessionState() {
-  // This store never discards session-only cookies, so this call has no effect.
-}
-
-void SQLitePersistentCookieStore::Flush(const base::Closure& callback) {
-  backend_->Flush(callback);
-}
-
-SQLitePersistentCookieStore::~SQLitePersistentCookieStore() {
-  backend_->Close();
-  // We release our reference to the Backend, though it will probably still have
-  // a reference if the background runner has not run Close() yet.
-}
-
-}  // namespace net