Migrate webkit/browser/ to storage/browser/

webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc

Index: webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc
diff --git a/webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc b/webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc
deleted file mode 100644
index 83d21b815407896e5090306d9db8b47e4db6c999..0000000000000000000000000000000000000000
--- a/webkit/browser/fileapi/sandbox_file_system_backend_delegate.cc
+++ /dev/null
@@ -1,673 +0,0 @@
-// Copyright 2013 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 "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
-
-#include <vector>
-
-#include "base/command_line.h"
-#include "base/file_util.h"
-#include "base/metrics/histogram.h"
-#include "base/stl_util.h"
-#include "base/task_runner_util.h"
-#include "net/base/net_util.h"
-#include "webkit/browser/blob/file_stream_reader.h"
-#include "webkit/browser/fileapi/async_file_util_adapter.h"
-#include "webkit/browser/fileapi/file_system_context.h"
-#include "webkit/browser/fileapi/file_system_operation_context.h"
-#include "webkit/browser/fileapi/file_system_url.h"
-#include "webkit/browser/fileapi/file_system_usage_cache.h"
-#include "webkit/browser/fileapi/obfuscated_file_util.h"
-#include "webkit/browser/fileapi/quota/quota_backend_impl.h"
-#include "webkit/browser/fileapi/quota/quota_reservation.h"
-#include "webkit/browser/fileapi/quota/quota_reservation_manager.h"
-#include "webkit/browser/fileapi/sandbox_file_stream_writer.h"
-#include "webkit/browser/fileapi/sandbox_file_system_backend.h"
-#include "webkit/browser/fileapi/sandbox_quota_observer.h"
-#include "webkit/browser/quota/quota_manager_proxy.h"
-#include "webkit/common/fileapi/file_system_util.h"
-
-namespace storage {
-
-namespace {
-
-const char kTemporaryOriginsCountLabel[] = "FileSystem.TemporaryOriginsCount";
-const char kPersistentOriginsCountLabel[] = "FileSystem.PersistentOriginsCount";
-
-const char kOpenFileSystemLabel[] = "FileSystem.OpenFileSystem";
-const char kOpenFileSystemDetailLabel[] = "FileSystem.OpenFileSystemDetail";
-const char kOpenFileSystemDetailNonThrottledLabel[] =
-    "FileSystem.OpenFileSystemDetailNonthrottled";
-int64 kMinimumStatsCollectionIntervalHours = 1;
-
-// For type directory names in ObfuscatedFileUtil.
-// TODO(kinuko,nhiroki): Each type string registration should be done
-// via its own backend.
-const char kTemporaryDirectoryName[] = "t";
-const char kPersistentDirectoryName[] = "p";
-const char kSyncableDirectoryName[] = "s";
-
-const char* kPrepopulateTypes[] = {
-  kPersistentDirectoryName,
-  kTemporaryDirectoryName
-};
-
-enum FileSystemError {
-  kOK = 0,
-  kIncognito,
-  kInvalidSchemeError,
-  kCreateDirectoryError,
-  kNotFound,
-  kUnknownError,
-  kFileSystemErrorMax,
-};
-
-// Restricted names.
-// http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
-const base::FilePath::CharType* const kRestrictedNames[] = {
-  FILE_PATH_LITERAL("."), FILE_PATH_LITERAL(".."),
-};
-
-// Restricted chars.
-const base::FilePath::CharType kRestrictedChars[] = {
-  FILE_PATH_LITERAL('/'), FILE_PATH_LITERAL('\\'),
-};
-
-std::string GetTypeStringForURL(const FileSystemURL& url) {
-  return SandboxFileSystemBackendDelegate::GetTypeString(url.type());
-}
-
-std::set<std::string> GetKnownTypeStrings() {
-  std::set<std::string> known_type_strings;
-  known_type_strings.insert(kTemporaryDirectoryName);
-  known_type_strings.insert(kPersistentDirectoryName);
-  known_type_strings.insert(kSyncableDirectoryName);
-  return known_type_strings;
-}
-
-class ObfuscatedOriginEnumerator
-    : public SandboxFileSystemBackendDelegate::OriginEnumerator {
- public:
-  explicit ObfuscatedOriginEnumerator(ObfuscatedFileUtil* file_util) {
-    enum_.reset(file_util->CreateOriginEnumerator());
-  }
-  virtual ~ObfuscatedOriginEnumerator() {}
-
-  virtual GURL Next() OVERRIDE {
-    return enum_->Next();
-  }
-
-  virtual bool HasFileSystemType(FileSystemType type) const OVERRIDE {
-    return enum_->HasTypeDirectory(
-        SandboxFileSystemBackendDelegate::GetTypeString(type));
-  }
-
- private:
-  scoped_ptr<ObfuscatedFileUtil::AbstractOriginEnumerator> enum_;
-};
-
-void OpenFileSystemOnFileTaskRunner(
-    ObfuscatedFileUtil* file_util,
-    const GURL& origin_url,
-    FileSystemType type,
-    OpenFileSystemMode mode,
-    base::File::Error* error_ptr) {
-  DCHECK(error_ptr);
-  const bool create = (mode == OPEN_FILE_SYSTEM_CREATE_IF_NONEXISTENT);
-  file_util->GetDirectoryForOriginAndType(
-      origin_url, SandboxFileSystemBackendDelegate::GetTypeString(type),
-      create, error_ptr);
-  if (*error_ptr != base::File::FILE_OK) {
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel,
-                              kCreateDirectoryError,
-                              kFileSystemErrorMax);
-  } else {
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemLabel, kOK, kFileSystemErrorMax);
-  }
-  // The reference of file_util will be derefed on the FILE thread
-  // when the storage of this callback gets deleted regardless of whether
-  // this method is called or not.
-}
-
-void DidOpenFileSystem(
-    base::WeakPtr<SandboxFileSystemBackendDelegate> delegate,
-    const base::Callback<void(base::File::Error error)>& callback,
-    base::File::Error* error) {
-  if (delegate.get())
-    delegate.get()->CollectOpenFileSystemMetrics(*error);
-  callback.Run(*error);
-}
-
-template <typename T>
-void DeleteSoon(base::SequencedTaskRunner* runner, T* ptr) {
-  if (!runner->DeleteSoon(FROM_HERE, ptr))
-    delete ptr;
-}
-
-}  // namespace
-
-const base::FilePath::CharType
-SandboxFileSystemBackendDelegate::kFileSystemDirectory[] =
-    FILE_PATH_LITERAL("File System");
-
-// static
-std::string SandboxFileSystemBackendDelegate::GetTypeString(
-    FileSystemType type) {
-  switch (type) {
-    case kFileSystemTypeTemporary:
-      return kTemporaryDirectoryName;
-    case kFileSystemTypePersistent:
-      return kPersistentDirectoryName;
-    case kFileSystemTypeSyncable:
-    case kFileSystemTypeSyncableForInternalSync:
-      return kSyncableDirectoryName;
-    case kFileSystemTypeUnknown:
-    default:
-      NOTREACHED() << "Unknown filesystem type requested:" << type;
-      return std::string();
-  }
-}
-
-SandboxFileSystemBackendDelegate::SandboxFileSystemBackendDelegate(
-    storage::QuotaManagerProxy* quota_manager_proxy,
-    base::SequencedTaskRunner* file_task_runner,
-    const base::FilePath& profile_path,
-    storage::SpecialStoragePolicy* special_storage_policy,
-    const FileSystemOptions& file_system_options)
-    : file_task_runner_(file_task_runner),
-      sandbox_file_util_(new AsyncFileUtilAdapter(
-          new ObfuscatedFileUtil(special_storage_policy,
-                                 profile_path.Append(kFileSystemDirectory),
-                                 file_system_options.env_override(),
-                                 file_task_runner,
-                                 base::Bind(&GetTypeStringForURL),
-                                 GetKnownTypeStrings(),
-                                 this))),
-      file_system_usage_cache_(new FileSystemUsageCache(file_task_runner)),
-      quota_observer_(new SandboxQuotaObserver(quota_manager_proxy,
-                                               file_task_runner,
-                                               obfuscated_file_util(),
-                                               usage_cache())),
-      quota_reservation_manager_(new QuotaReservationManager(
-          scoped_ptr<QuotaReservationManager::QuotaBackend>(
-              new QuotaBackendImpl(file_task_runner_.get(),
-                                   obfuscated_file_util(),
-                                   usage_cache(),
-                                   quota_manager_proxy)))),
-      special_storage_policy_(special_storage_policy),
-      file_system_options_(file_system_options),
-      is_filesystem_opened_(false),
-      weak_factory_(this) {
-  // Prepopulate database only if it can run asynchronously (i.e. the current
-  // thread is not file_task_runner). Usually this is the case but may not
-  // in test code.
-  if (!file_system_options.is_incognito() &&
-      !file_task_runner_->RunsTasksOnCurrentThread()) {
-    std::vector<std::string> types_to_prepopulate(
-        &kPrepopulateTypes[0],
-        &kPrepopulateTypes[arraysize(kPrepopulateTypes)]);
-    file_task_runner_->PostTask(
-        FROM_HERE,
-        base::Bind(&ObfuscatedFileUtil::MaybePrepopulateDatabase,
-                  base::Unretained(obfuscated_file_util()),
-                  types_to_prepopulate));
-  }
-}
-
-SandboxFileSystemBackendDelegate::~SandboxFileSystemBackendDelegate() {
-  io_thread_checker_.DetachFromThread();
-
-  if (!file_task_runner_->RunsTasksOnCurrentThread()) {
-    DeleteSoon(file_task_runner_.get(), quota_reservation_manager_.release());
-    DeleteSoon(file_task_runner_.get(), sandbox_file_util_.release());
-    DeleteSoon(file_task_runner_.get(), quota_observer_.release());
-    DeleteSoon(file_task_runner_.get(), file_system_usage_cache_.release());
-  }
-}
-
-SandboxFileSystemBackendDelegate::OriginEnumerator*
-SandboxFileSystemBackendDelegate::CreateOriginEnumerator() {
-  return new ObfuscatedOriginEnumerator(obfuscated_file_util());
-}
-
-base::FilePath
-SandboxFileSystemBackendDelegate::GetBaseDirectoryForOriginAndType(
-    const GURL& origin_url,
-    FileSystemType type,
-    bool create) {
-  base::File::Error error = base::File::FILE_OK;
-  base::FilePath path = obfuscated_file_util()->GetDirectoryForOriginAndType(
-      origin_url, GetTypeString(type), create, &error);
-  if (error != base::File::FILE_OK)
-    return base::FilePath();
-  return path;
-}
-
-void SandboxFileSystemBackendDelegate::OpenFileSystem(
-    const GURL& origin_url,
-    FileSystemType type,
-    OpenFileSystemMode mode,
-    const OpenFileSystemCallback& callback,
-    const GURL& root_url) {
-  if (!IsAllowedScheme(origin_url)) {
-    callback.Run(GURL(), std::string(), base::File::FILE_ERROR_SECURITY);
-    return;
-  }
-
-  std::string name = GetFileSystemName(origin_url, type);
-
-  base::File::Error* error_ptr = new base::File::Error;
-  file_task_runner_->PostTaskAndReply(
-      FROM_HERE,
-      base::Bind(&OpenFileSystemOnFileTaskRunner,
-                 obfuscated_file_util(), origin_url, type, mode,
-                 base::Unretained(error_ptr)),
-      base::Bind(&DidOpenFileSystem,
-                 weak_factory_.GetWeakPtr(),
-                 base::Bind(callback, root_url, name),
-                 base::Owned(error_ptr)));
-
-  io_thread_checker_.DetachFromThread();
-  is_filesystem_opened_ = true;
-}
-
-scoped_ptr<FileSystemOperationContext>
-SandboxFileSystemBackendDelegate::CreateFileSystemOperationContext(
-    const FileSystemURL& url,
-    FileSystemContext* context,
-    base::File::Error* error_code) const {
-  if (!IsAccessValid(url)) {
-    *error_code = base::File::FILE_ERROR_SECURITY;
-    return scoped_ptr<FileSystemOperationContext>();
-  }
-
-  const UpdateObserverList* update_observers = GetUpdateObservers(url.type());
-  const ChangeObserverList* change_observers = GetChangeObservers(url.type());
-  DCHECK(update_observers);
-
-  scoped_ptr<FileSystemOperationContext> operation_context(
-      new FileSystemOperationContext(context));
-  operation_context->set_update_observers(*update_observers);
-  operation_context->set_change_observers(
-      change_observers ? *change_observers : ChangeObserverList());
-
-  return operation_context.Pass();
-}
-
-scoped_ptr<storage::FileStreamReader>
-SandboxFileSystemBackendDelegate::CreateFileStreamReader(
-    const FileSystemURL& url,
-    int64 offset,
-    const base::Time& expected_modification_time,
-    FileSystemContext* context) const {
-  if (!IsAccessValid(url))
-    return scoped_ptr<storage::FileStreamReader>();
-  return scoped_ptr<storage::FileStreamReader>(
-      storage::FileStreamReader::CreateForFileSystemFile(
-          context, url, offset, expected_modification_time));
-}
-
-scoped_ptr<FileStreamWriter>
-SandboxFileSystemBackendDelegate::CreateFileStreamWriter(
-    const FileSystemURL& url,
-    int64 offset,
-    FileSystemContext* context,
-    FileSystemType type) const {
-  if (!IsAccessValid(url))
-    return scoped_ptr<FileStreamWriter>();
-  const UpdateObserverList* observers = GetUpdateObservers(type);
-  DCHECK(observers);
-  return scoped_ptr<FileStreamWriter>(
-      new SandboxFileStreamWriter(context, url, offset, *observers));
-}
-
-base::File::Error
-SandboxFileSystemBackendDelegate::DeleteOriginDataOnFileTaskRunner(
-    FileSystemContext* file_system_context,
-    storage::QuotaManagerProxy* proxy,
-    const GURL& origin_url,
-    FileSystemType type) {
-  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
-  int64 usage = GetOriginUsageOnFileTaskRunner(
-      file_system_context, origin_url, type);
-  usage_cache()->CloseCacheFiles();
-  bool result = obfuscated_file_util()->DeleteDirectoryForOriginAndType(
-      origin_url, GetTypeString(type));
-  if (result && proxy) {
-    proxy->NotifyStorageModified(storage::QuotaClient::kFileSystem,
-                                 origin_url,
-                                 FileSystemTypeToQuotaStorageType(type),
-                                 -usage);
-  }
-
-  if (result)
-    return base::File::FILE_OK;
-  return base::File::FILE_ERROR_FAILED;
-}
-
-void SandboxFileSystemBackendDelegate::GetOriginsForTypeOnFileTaskRunner(
-    FileSystemType type, std::set<GURL>* origins) {
-  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
-  DCHECK(origins);
-  scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
-  GURL origin;
-  while (!(origin = enumerator->Next()).is_empty()) {
-    if (enumerator->HasFileSystemType(type))
-      origins->insert(origin);
-  }
-  switch (type) {
-    case kFileSystemTypeTemporary:
-      UMA_HISTOGRAM_COUNTS(kTemporaryOriginsCountLabel, origins->size());
-      break;
-    case kFileSystemTypePersistent:
-      UMA_HISTOGRAM_COUNTS(kPersistentOriginsCountLabel, origins->size());
-      break;
-    default:
-      break;
-  }
-}
-
-void SandboxFileSystemBackendDelegate::GetOriginsForHostOnFileTaskRunner(
-    FileSystemType type, const std::string& host,
-    std::set<GURL>* origins) {
-  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
-  DCHECK(origins);
-  scoped_ptr<OriginEnumerator> enumerator(CreateOriginEnumerator());
-  GURL origin;
-  while (!(origin = enumerator->Next()).is_empty()) {
-    if (host == net::GetHostOrSpecFromURL(origin) &&
-        enumerator->HasFileSystemType(type))
-      origins->insert(origin);
-  }
-}
-
-int64 SandboxFileSystemBackendDelegate::GetOriginUsageOnFileTaskRunner(
-    FileSystemContext* file_system_context,
-    const GURL& origin_url,
-    FileSystemType type) {
-  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
-
-  // Don't use usage cache and return recalculated usage for sticky invalidated
-  // origins.
-  if (ContainsKey(sticky_dirty_origins_, std::make_pair(origin_url, type)))
-    return RecalculateUsage(file_system_context, origin_url, type);
-
-  base::FilePath base_path =
-      GetBaseDirectoryForOriginAndType(origin_url, type, false);
-  if (base_path.empty() || !base::DirectoryExists(base_path))
-    return 0;
-  base::FilePath usage_file_path =
-      base_path.Append(FileSystemUsageCache::kUsageFileName);
-
-  bool is_valid = usage_cache()->IsValid(usage_file_path);
-  uint32 dirty_status = 0;
-  bool dirty_status_available =
-      usage_cache()->GetDirty(usage_file_path, &dirty_status);
-  bool visited = !visited_origins_.insert(origin_url).second;
-  if (is_valid && (dirty_status == 0 || (dirty_status_available && visited))) {
-    // The usage cache is clean (dirty == 0) or the origin is already
-    // initialized and running.  Read the cache file to get the usage.
-    int64 usage = 0;
-    return usage_cache()->GetUsage(usage_file_path, &usage) ? usage : -1;
-  }
-  // The usage cache has not been initialized or the cache is dirty.
-  // Get the directory size now and update the cache.
-  usage_cache()->Delete(usage_file_path);
-
-  int64 usage = RecalculateUsage(file_system_context, origin_url, type);
-
-  // This clears the dirty flag too.
-  usage_cache()->UpdateUsage(usage_file_path, usage);
-  return usage;
-}
-
-scoped_refptr<QuotaReservation>
-SandboxFileSystemBackendDelegate::CreateQuotaReservationOnFileTaskRunner(
-    const GURL& origin,
-    FileSystemType type) {
-  DCHECK(file_task_runner_->RunsTasksOnCurrentThread());
-  DCHECK(quota_reservation_manager_);
-  return quota_reservation_manager_->CreateReservation(origin, type);
-}
-
-void SandboxFileSystemBackendDelegate::AddFileUpdateObserver(
-    FileSystemType type,
-    FileUpdateObserver* observer,
-    base::SequencedTaskRunner* task_runner) {
-  DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
-  update_observers_[type] =
-      update_observers_[type].AddObserver(observer, task_runner);
-}
-
-void SandboxFileSystemBackendDelegate::AddFileChangeObserver(
-    FileSystemType type,
-    FileChangeObserver* observer,
-    base::SequencedTaskRunner* task_runner) {
-  DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
-  change_observers_[type] =
-      change_observers_[type].AddObserver(observer, task_runner);
-}
-
-void SandboxFileSystemBackendDelegate::AddFileAccessObserver(
-    FileSystemType type,
-    FileAccessObserver* observer,
-    base::SequencedTaskRunner* task_runner) {
-  DCHECK(!is_filesystem_opened_ || io_thread_checker_.CalledOnValidThread());
-  access_observers_[type] =
-      access_observers_[type].AddObserver(observer, task_runner);
-}
-
-const UpdateObserverList* SandboxFileSystemBackendDelegate::GetUpdateObservers(
-    FileSystemType type) const {
-  std::map<FileSystemType, UpdateObserverList>::const_iterator iter =
-      update_observers_.find(type);
-  if (iter == update_observers_.end())
-    return NULL;
-  return &iter->second;
-}
-
-const ChangeObserverList* SandboxFileSystemBackendDelegate::GetChangeObservers(
-    FileSystemType type) const {
-  std::map<FileSystemType, ChangeObserverList>::const_iterator iter =
-      change_observers_.find(type);
-  if (iter == change_observers_.end())
-    return NULL;
-  return &iter->second;
-}
-
-const AccessObserverList* SandboxFileSystemBackendDelegate::GetAccessObservers(
-    FileSystemType type) const {
-  std::map<FileSystemType, AccessObserverList>::const_iterator iter =
-      access_observers_.find(type);
-  if (iter == access_observers_.end())
-    return NULL;
-  return &iter->second;
-}
-
-void SandboxFileSystemBackendDelegate::RegisterQuotaUpdateObserver(
-    FileSystemType type) {
-  AddFileUpdateObserver(type, quota_observer_.get(), file_task_runner_.get());
-}
-
-void SandboxFileSystemBackendDelegate::InvalidateUsageCache(
-    const GURL& origin,
-    FileSystemType type) {
-  base::File::Error error = base::File::FILE_OK;
-  base::FilePath usage_file_path = GetUsageCachePathForOriginAndType(
-      obfuscated_file_util(), origin, type, &error);
-  if (error != base::File::FILE_OK)
-    return;
-  usage_cache()->IncrementDirty(usage_file_path);
-}
-
-void SandboxFileSystemBackendDelegate::StickyInvalidateUsageCache(
-    const GURL& origin,
-    FileSystemType type) {
-  sticky_dirty_origins_.insert(std::make_pair(origin, type));
-  quota_observer()->SetUsageCacheEnabled(origin, type, false);
-  InvalidateUsageCache(origin, type);
-}
-
-FileSystemFileUtil* SandboxFileSystemBackendDelegate::sync_file_util() {
-  return static_cast<AsyncFileUtilAdapter*>(file_util())->sync_file_util();
-}
-
-bool SandboxFileSystemBackendDelegate::IsAccessValid(
-    const FileSystemURL& url) const {
-  if (!IsAllowedScheme(url.origin()))
-    return false;
-
-  if (url.path().ReferencesParent())
-    return false;
-
-  // Return earlier if the path is '/', because VirtualPath::BaseName()
-  // returns '/' for '/' and we fail the "basename != '/'" check below.
-  // (We exclude '.' because it's disallowed by spec.)
-  if (VirtualPath::IsRootPath(url.path()) &&
-      url.path() != base::FilePath(base::FilePath::kCurrentDirectory))
-    return true;
-
-  // Restricted names specified in
-  // http://dev.w3.org/2009/dap/file-system/file-dir-sys.html#naming-restrictions
-  base::FilePath filename = VirtualPath::BaseName(url.path());
-  // See if the name is allowed to create.
-  for (size_t i = 0; i < arraysize(kRestrictedNames); ++i) {
-    if (filename.value() == kRestrictedNames[i])
-      return false;
-  }
-  for (size_t i = 0; i < arraysize(kRestrictedChars); ++i) {
-    if (filename.value().find(kRestrictedChars[i]) !=
-        base::FilePath::StringType::npos)
-      return false;
-  }
-
-  return true;
-}
-
-bool SandboxFileSystemBackendDelegate::IsAllowedScheme(const GURL& url) const {
-  // Basically we only accept http or https. We allow file:// URLs
-  // only if --allow-file-access-from-files flag is given.
-  if (url.SchemeIsHTTPOrHTTPS())
-    return true;
-  if (url.SchemeIsFileSystem())
-    return url.inner_url() && IsAllowedScheme(*url.inner_url());
-
-  for (size_t i = 0;
-       i < file_system_options_.additional_allowed_schemes().size();
-       ++i) {
-    if (url.SchemeIs(
-            file_system_options_.additional_allowed_schemes()[i].c_str()))
-      return true;
-  }
-  return false;
-}
-
-base::FilePath
-SandboxFileSystemBackendDelegate::GetUsageCachePathForOriginAndType(
-    const GURL& origin_url,
-    FileSystemType type) {
-  base::File::Error error;
-  base::FilePath path = GetUsageCachePathForOriginAndType(
-      obfuscated_file_util(), origin_url, type, &error);
-  if (error != base::File::FILE_OK)
-    return base::FilePath();
-  return path;
-}
-
-// static
-base::FilePath
-SandboxFileSystemBackendDelegate::GetUsageCachePathForOriginAndType(
-    ObfuscatedFileUtil* sandbox_file_util,
-    const GURL& origin_url,
-    FileSystemType type,
-    base::File::Error* error_out) {
-  DCHECK(error_out);
-  *error_out = base::File::FILE_OK;
-  base::FilePath base_path = sandbox_file_util->GetDirectoryForOriginAndType(
-      origin_url, GetTypeString(type), false /* create */, error_out);
-  if (*error_out != base::File::FILE_OK)
-    return base::FilePath();
-  return base_path.Append(FileSystemUsageCache::kUsageFileName);
-}
-
-int64 SandboxFileSystemBackendDelegate::RecalculateUsage(
-    FileSystemContext* context,
-    const GURL& origin,
-    FileSystemType type) {
-  FileSystemOperationContext operation_context(context);
-  FileSystemURL url = context->CreateCrackedFileSystemURL(
-      origin, type, base::FilePath());
-  scoped_ptr<FileSystemFileUtil::AbstractFileEnumerator> enumerator(
-      obfuscated_file_util()->CreateFileEnumerator(
-          &operation_context, url, true));
-
-  base::FilePath file_path_each;
-  int64 usage = 0;
-
-  while (!(file_path_each = enumerator->Next()).empty()) {
-    usage += enumerator->Size();
-    usage += ObfuscatedFileUtil::ComputeFilePathCost(file_path_each);
-  }
-
-  return usage;
-}
-
-void SandboxFileSystemBackendDelegate::CollectOpenFileSystemMetrics(
-    base::File::Error error_code) {
-  base::Time now = base::Time::Now();
-  bool throttled = now < next_release_time_for_open_filesystem_stat_;
-  if (!throttled) {
-    next_release_time_for_open_filesystem_stat_ =
-        now + base::TimeDelta::FromHours(kMinimumStatsCollectionIntervalHours);
-  }
-
-#define REPORT(report_value)                                            \
-  UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailLabel,                 \
-                            (report_value),                             \
-                            kFileSystemErrorMax);                       \
-  if (!throttled) {                                                     \
-    UMA_HISTOGRAM_ENUMERATION(kOpenFileSystemDetailNonThrottledLabel,   \
-                              (report_value),                           \
-                              kFileSystemErrorMax);                     \
-  }
-
-  switch (error_code) {
-    case base::File::FILE_OK:
-      REPORT(kOK);
-      break;
-    case base::File::FILE_ERROR_INVALID_URL:
-      REPORT(kInvalidSchemeError);
-      break;
-    case base::File::FILE_ERROR_NOT_FOUND:
-      REPORT(kNotFound);
-      break;
-    case base::File::FILE_ERROR_FAILED:
-    default:
-      REPORT(kUnknownError);
-      break;
-  }
-#undef REPORT
-}
-
-ObfuscatedFileUtil* SandboxFileSystemBackendDelegate::obfuscated_file_util() {
-  return static_cast<ObfuscatedFileUtil*>(sync_file_util());
-}
-
-// Declared in obfuscated_file_util.h.
-// static
-ObfuscatedFileUtil* ObfuscatedFileUtil::CreateForTesting(
-    storage::SpecialStoragePolicy* special_storage_policy,
-    const base::FilePath& file_system_directory,
-    leveldb::Env* env_override,
-    base::SequencedTaskRunner* file_task_runner) {
-  return new ObfuscatedFileUtil(special_storage_policy,
-                                file_system_directory,
-                                env_override,
-                                file_task_runner,
-                                base::Bind(&GetTypeStringForURL),
-                                GetKnownTypeStrings(),
-                                NULL);
-}
-
-}  // namespace storage