Support partitioning of storage contexts based on render_id.

content/browser/browser_context.cc

 // 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 "content/public/browser/browser_context.h"
 
+#include "base/file_path.h"
+#include "base/stl_util.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/dom_storage/dom_storage_context_impl.h"
 #include "content/browser/download/download_file_manager.h"
 #include "content/browser/download/download_manager_impl.h"
 #include "content/browser/fileapi/browser_file_system_helper.h"
 #include "content/browser/in_process_webkit/indexed_db_context_impl.h"
 #include "content/browser/renderer_host/resource_dispatcher_host_impl.h"
 #include "content/browser/resource_context_impl.h"
+#include "content/common/child_process_host_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_constants.h"
 #include "net/base/server_bound_cert_service.h"
 #include "net/base/server_bound_cert_store.h"
 #include "net/cookies/cookie_monster.h"
 #include "net/cookies/cookie_store.h"
 #include "net/url_request/url_request_context.h"
 #include "webkit/database/database_tracker.h"
 #include "webkit/quota/quota_manager.h"
 
 using appcache::AppCacheService;
 using base::UserDataAdapter;
 using content::BrowserThread;
 using fileapi::FileSystemContext;
 using quota::QuotaManager;
 using webkit_database::DatabaseTracker;
 
 // Key names on BrowserContext.
-static const char* kAppCacheServicKeyName = "content_appcache_service_tracker";
-static const char* kDatabaseTrackerKeyName = "content_database_tracker";
-static const char* kDOMStorageContextKeyName = "content_dom_storage_context";
 static const char* kDownloadManagerKeyName = "download_manager";
-static const char* kFileSystemContextKeyName = "content_file_system_context";
-static const char* kIndexedDBContextKeyName = "content_indexed_db_context";
-static const char* kQuotaManagerKeyName = "content_quota_manager";
+static const char* kStorageParitionMapKeyName = "content_storage_partition_map";
+
+// Dirname for storing persistent data for renderers with isolated storage.
+const FilePath::CharType kStoragePartitionDirName[] =
+    FILE_PATH_LITERAL("Storage Partitions");
 
 namespace content {
 
 namespace {
 
-void CreateQuotaManagerAndClients(BrowserContext* context) {
-  // Ensure that these methods are called on the UI thread, except for unittests
-  // where a UI thread might not have been created.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
-         !BrowserThread::IsMessageLoopValid(BrowserThread::UI));
-  if (context->GetUserData(kQuotaManagerKeyName)) {
-    DCHECK(context->GetUserData(kDatabaseTrackerKeyName));
-    DCHECK(context->GetUserData(kDOMStorageContextKeyName));
-    DCHECK(context->GetUserData(kFileSystemContextKeyName));
-    DCHECK(context->GetUserData(kIndexedDBContextKeyName));
+// Defines the what persistent state a child process can access.
+//
+// The StoragePartition defines the view each child process has of the
+// persistent state inside the BrowserContext. This is used to implement
+// isolated storage where a renderer with isolated storage cannot see
+// the cookies, localStorage, etc., that normal web renderers have access to.
+class StoragePartition {
+ public:
+  ~StoragePartition() {
+    // These message loop checks are just to avoid leaks in unittests.
+    if (database_tracker() &&
+        BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
+      BrowserThread::PostTask(
+          BrowserThread::FILE, FROM_HERE,
+          base::Bind(&webkit_database::DatabaseTracker::Shutdown,
+                     database_tracker()));
+    }
+
+    if (dom_storage_context())
+      dom_storage_context()->Shutdown();
+  }
+
+  // TODO(ajwong): Break the direct dependency on |context|. We only
+  // need 3 pieces of info from it.
+  static StoragePartition* Create(BrowserContext* context,
+                                  FilePath partition_path) {
+    // Ensure that these methods are called on the UI thread, except for
+    // unittests where a UI thread might not have been created.
+    DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
+           !BrowserThread::IsMessageLoopValid(BrowserThread::UI));
+
+    // All of the clients have to be created and registered with the
+    // QuotaManager prior to the QuotaManger being used. We do them
+    // all together here prior to handing out a reference to anything
+    // that utilizes the QuotaManager.
+    scoped_refptr<QuotaManager> quota_manager = new quota::QuotaManager(
+        context->IsOffTheRecord(), partition_path,
+        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
+        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB),
+        context->GetSpecialStoragePolicy());
+
+    // Each consumer is responsible for registering its QuotaClient during
+    // its construction.
+    scoped_refptr<FileSystemContext> filesystem_context =
+        CreateFileSystemContext(partition_path, context->IsOffTheRecord(),
+                                context->GetSpecialStoragePolicy(),
+                                quota_manager->proxy());
+
+    scoped_refptr<DatabaseTracker> database_tracker = new DatabaseTracker(
+        partition_path, context->IsOffTheRecord(),
+        context->GetSpecialStoragePolicy(), quota_manager->proxy(),
+        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
+
+    FilePath path = context->IsOffTheRecord() ? FilePath() : partition_path;
+    scoped_refptr<DOMStorageContextImpl> dom_storage_context =
+        new DOMStorageContextImpl(path, context->GetSpecialStoragePolicy());
+
+    scoped_refptr<IndexedDBContextImpl> indexed_db_context =
+        new IndexedDBContextImpl(path, context->GetSpecialStoragePolicy(),
+                                 quota_manager->proxy(),
+                                 BrowserThread::GetMessageLoopProxyForThread(
+                                     BrowserThread::WEBKIT_DEPRECATED));
+
+    scoped_refptr<ChromeAppCacheService> appcache_service =
+        new ChromeAppCacheService(quota_manager->proxy());
+
+    return new StoragePartition(partition_path,
+                                quota_manager,
+                                appcache_service,
+                                filesystem_context,
+                                database_tracker,
+                                dom_storage_context,
+                                indexed_db_context);
+  }
+
+  quota::QuotaManager* quota_manager() {
+    return quota_manager_;

[jam, 2012/07/11 02:09:25]

nit: fit on one line where you can for readability?

[awong, 2012/07/11 21:17:17]

Done.

+  }
+  ChromeAppCacheService* appcache_service() {
+    return appcache_service_;
+  }
+  fileapi::FileSystemContext* filesystem_context() {
+    return filesystem_context_;
+  }
+  webkit_database::DatabaseTracker* database_tracker() {
+    return database_tracker_;
+  }
+  DOMStorageContextImpl* dom_storage_context() {
+    return dom_storage_context_;
+  }
+  IndexedDBContext* indexed_db_context() {
+    return indexed_db_context_;
+  }
+
+ private:
+  StoragePartition(const FilePath& partition_path,
+                   quota::QuotaManager* quota_manager,
+                   ChromeAppCacheService* appcache_service,
+                   fileapi::FileSystemContext* filesystem_context,
+                   webkit_database::DatabaseTracker* database_tracker,
+                   DOMStorageContextImpl* dom_storage_context,
+                   IndexedDBContext* indexed_db_context)
+      : partition_path_(partition_path),
+        quota_manager_(quota_manager),
+        appcache_service_(appcache_service),
+        filesystem_context_(filesystem_context),
+        database_tracker_(database_tracker),
+        dom_storage_context_(dom_storage_context),
+        indexed_db_context_(indexed_db_context) {
+  }
+
+  FilePath partition_path_;
+  scoped_refptr<quota::QuotaManager> quota_manager_;
+  scoped_refptr<ChromeAppCacheService> appcache_service_;
+  scoped_refptr<fileapi::FileSystemContext> filesystem_context_;
+  scoped_refptr<webkit_database::DatabaseTracker> database_tracker_;
+  scoped_refptr<DOMStorageContextImpl> dom_storage_context_;
+  scoped_refptr<IndexedDBContext> indexed_db_context_;
+};
+
+// A std::string to StoragePartition map for use with SupportsUserData APIs.
+class StoragePartitionMap : public base::SupportsUserData::Data {
+ public:
+  explicit StoragePartitionMap(BrowserContext* browser_context)
+      : browser_context_(browser_context) {
+  }
+
+  virtual ~StoragePartitionMap() {
+    STLDeleteContainerPairSecondPointers(partitions_.begin(),
+                                         partitions_.end());
+  }
+
+  // This map retains ownership of the returned StoragePartition objects.
+  StoragePartition* Get(const std::string& partition_id) {
+    // Find the previously created partition if it's available.
+    std::map<std::string, StoragePartition*>::const_iterator it =
+        partitions_.find(partition_id);
+    if (it != partitions_.end())
+      return it->second;
+
+    // There was no previous partition, so let's make a new one.
+    FilePath partition_path = browser_context_->GetPath();
+    if (!partition_id.empty()) {
+      CHECK(IsStringASCII(partition_id));
+      partition_path = partition_path.Append(kStoragePartitionDirName)
+          .AppendASCII(partition_id);
+    }
+
+    StoragePartition* storage_partition =
+        StoragePartition::Create(browser_context_, partition_path);
+    partitions_[partition_id] = storage_partition;
+
+    PostCreateInitialization(storage_partition, partition_path);
+
+    // TODO(ajwong): We need to remove this conditional by making
+    // InitializeResourceContext() understand having different partition data
+    // based on the renderer_id.
+    if (partition_id.empty()) {
+      InitializeResourceContext(browser_context_);
+    }
+
+    return storage_partition;
+  }
+
+  void ForEach(const base::Callback<void(StoragePartition*)>& callback) {
+    for (std::map<std::string, StoragePartition*>::const_iterator it =
+             partitions_.begin();
+         it != partitions_.end();
+         ++it) {
+      callback.Run(it->second);
+    }
+  }
+
+ private:
+  // TODO(ajwong): This must always be called *after* it's been added to the
+  // partition map.  This feels dangerous.  Should this not be in this class?
+  void PostCreateInitialization(StoragePartition* partition,
+                                const FilePath& partition_path) {
+    // Check first to avoid memory leak in unittests.
+    if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
+      BrowserThread::PostTask(
+          BrowserThread::IO, FROM_HERE,
+          base::Bind(&ChromeAppCacheService::InitializeOnIOThread,
+                     partition->appcache_service(),
+                     browser_context_->IsOffTheRecord() ? FilePath() :
+                         partition_path.Append(content::kAppCacheDirname),
+                         browser_context_->GetResourceContext(),
+                     make_scoped_refptr(
+                         browser_context_->GetSpecialStoragePolicy())));
+    }
+  }
+
+  BrowserContext* browser_context_;
+  std::map<std::string, StoragePartition*> partitions_;
+};
+
+StoragePartition* GetStoragePartition(BrowserContext* browser_context,
+                                      int renderer_child_id) {
+  StoragePartitionMap* partition_map = static_cast<StoragePartitionMap*>(
+      browser_context->GetUserData(kStorageParitionMapKeyName));
+  if (!partition_map) {
+    partition_map = new StoragePartitionMap(browser_context);
+    browser_context->SetUserData(kStorageParitionMapKeyName, partition_map);
+  }
+
+  const std::string& partition_id =
+      GetContentClient()->browser()->GetStoragePartitionIdForChildProcess(
+          browser_context,
+          renderer_child_id);
+
+  return partition_map->Get(partition_id);
+}
+
+// Run |callback| on each storage partition in |browser_context|.
+void ForEachStoragePartition(
+    BrowserContext* browser_context,
+    const base::Callback<void(StoragePartition*)>& callback) {
+  StoragePartitionMap* partition_map = static_cast<StoragePartitionMap*>(
+      browser_context->GetUserData(kStorageParitionMapKeyName));
+  if (!partition_map) {
     return;
   }
 
-  // All of the clients have to be created and registered with the
-  // QuotaManager prior to the QuotaManger being used. So we do them
-  // all together here prior to handing out a reference to anything
-  // that utlizes the QuotaManager.
-  scoped_refptr<QuotaManager> quota_manager = new quota::QuotaManager(
-    context->IsOffTheRecord(), context->GetPath(),
-    BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO),
-    BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB),
-    context->GetSpecialStoragePolicy());
-  context->SetUserData(kQuotaManagerKeyName,
-                       new UserDataAdapter<QuotaManager>(quota_manager));
-
-  // Each consumer is responsible for registering its QuotaClient during
-  // its construction.
-  scoped_refptr<FileSystemContext> filesystem_context = CreateFileSystemContext(
-      context->GetPath(), context->IsOffTheRecord(),
-      context->GetSpecialStoragePolicy(), quota_manager->proxy());
-  context->SetUserData(
-      kFileSystemContextKeyName,
-      new UserDataAdapter<FileSystemContext>(filesystem_context));
-
-  scoped_refptr<DatabaseTracker> db_tracker = new DatabaseTracker(
-      context->GetPath(), context->IsOffTheRecord(),
-      context->GetSpecialStoragePolicy(), quota_manager->proxy(),
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE));
-  context->SetUserData(kDatabaseTrackerKeyName,
-                       new UserDataAdapter<DatabaseTracker>(db_tracker));
-
-  FilePath path = context->IsOffTheRecord() ? FilePath() : context->GetPath();
-  scoped_refptr<DOMStorageContextImpl> dom_storage_context =
-      new DOMStorageContextImpl(path, context->GetSpecialStoragePolicy());
-  context->SetUserData(
-      kDOMStorageContextKeyName,
-      new UserDataAdapter<DOMStorageContextImpl>(dom_storage_context));
-
-  scoped_refptr<IndexedDBContext> indexed_db_context = new IndexedDBContextImpl(
-      path, context->GetSpecialStoragePolicy(), quota_manager->proxy(),
-      BrowserThread::GetMessageLoopProxyForThread(
-          BrowserThread::WEBKIT_DEPRECATED));
-  context->SetUserData(
-      kIndexedDBContextKeyName,
-      new UserDataAdapter<IndexedDBContext>(indexed_db_context));
-
-  scoped_refptr<ChromeAppCacheService> appcache_service =
-      new ChromeAppCacheService(quota_manager->proxy());
-  context->SetUserData(
-      kAppCacheServicKeyName,
-      new UserDataAdapter<ChromeAppCacheService>(appcache_service));
-
-  InitializeResourceContext(context);
-
-  // Check first to avoid memory leak in unittests.
-  if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
-    BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
-        base::Bind(&ChromeAppCacheService::InitializeOnIOThread,
-                   appcache_service,
-                   context->IsOffTheRecord() ? FilePath() :
-                       context->GetPath().Append(content::kAppCacheDirname),
-                   context->GetResourceContext(),
-                   make_scoped_refptr(context->GetSpecialStoragePolicy())));
-  }
+  partition_map->ForEach(callback);
+}
+
+// Used to convert a callback meant to take a DOMStorageContextImpl* into one
+// that can take a StoragePartition*.
+void ProcessDOMStorageContext(
+    const base::Callback<void(DOMStorageContextImpl*)>& callback,
+    StoragePartition* partition) {
+  callback.Run(partition->dom_storage_context());
+}
+
+// Run |callback| on each DOMStorageContextImpl in |browser_context|.
+void ForEachDOMStorageContext(
+      BrowserContext* browser_context,
+      const base::Callback<void(DOMStorageContextImpl*)>& callback) {
+  ForEachStoragePartition(browser_context,
+                          base::Bind(&ProcessDOMStorageContext, callback));
 }
 
 void SaveSessionStateOnIOThread(ResourceContext* resource_context) {
   resource_context->GetRequestContext()->cookie_store()->GetCookieMonster()->
       SetForceKeepSessionState();
   resource_context->GetRequestContext()->server_bound_cert_service()->
       GetCertStore()->SetForceKeepSessionState();
   ResourceContext::GetAppCacheService(resource_context)->
       set_force_keep_session_state();
 }
 
 void SaveSessionStateOnWebkitThread(
     scoped_refptr<IndexedDBContextImpl> indexed_db_context) {
   indexed_db_context->SetForceKeepSessionState();
 }
 
 void PurgeMemoryOnIOThread(ResourceContext* resource_context) {
   ResourceContext::GetAppCacheService(resource_context)->PurgeMemory();
 }
 
-DOMStorageContextImpl* GetDOMStorageContextImpl(BrowserContext* context) {
+DOMStorageContextImpl* GetDefaultDOMStorageContextImpl(
+    BrowserContext* context) {
   return static_cast<DOMStorageContextImpl*>(
-      BrowserContext::GetDOMStorageContext(context));
+      BrowserContext::GetDefaultDOMStorageContext(context));
 }
 
 }  // namespace
 
 DownloadManager* BrowserContext::GetDownloadManager(
     BrowserContext* context) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (!context->GetUserData(kDownloadManagerKeyName)) {
     ResourceDispatcherHostImpl* rdh = ResourceDispatcherHostImpl::Get();
     DCHECK(rdh);
     DownloadFileManager* file_manager = rdh->download_file_manager();
     DCHECK(file_manager);
     scoped_refptr<DownloadManager> download_manager =
         new DownloadManagerImpl(
             file_manager,
             scoped_ptr<DownloadItemFactory>(),
             GetContentClient()->browser()->GetNetLog());
 
     context->SetUserData(
         kDownloadManagerKeyName,
         new UserDataAdapter<DownloadManager>(download_manager));
     download_manager->SetDelegate(context->GetDownloadManagerDelegate());
     download_manager->Init(context);
   }
 
   return UserDataAdapter<DownloadManager>::Get(
       context, kDownloadManagerKeyName);
 }
 
-QuotaManager* BrowserContext::GetQuotaManager(BrowserContext* context) {
-  CreateQuotaManagerAndClients(context);
-  return UserDataAdapter<QuotaManager>::Get(context, kQuotaManagerKeyName);
+QuotaManager* BrowserContext::GetQuotaManager(BrowserContext* browser_context) {
+  // TODO(ajwong): Change this API to require a process id instead of using
+  // kInvalidChildProcessId.
+  StoragePartition* partition =
+      GetStoragePartition(browser_context,
+                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return partition->quota_manager();
+}
+
+DOMStorageContext* BrowserContext::GetDefaultDOMStorageContext(
+    BrowserContext* browser_context) {
+  // TODO(ajwong): Force all users to know which process id they are performing
+  // actions on behalf of, migrate them to GetDOMStorageContext(), and then
+  // delete this function.
+  return GetDOMStorageContext(browser_context,
+                              ChildProcessHostImpl::kInvalidChildProcessId);
 }
 
 DOMStorageContext* BrowserContext::GetDOMStorageContext(
-    BrowserContext* context) {
-  CreateQuotaManagerAndClients(context);
-  return UserDataAdapter<DOMStorageContextImpl>::Get(
-      context, kDOMStorageContextKeyName);
+    BrowserContext* browser_context,
+    int render_child_id) {
+  StoragePartition* partition =
+      GetStoragePartition(browser_context, render_child_id);
+  return partition->dom_storage_context();
 }
 
-IndexedDBContext* BrowserContext::GetIndexedDBContext(BrowserContext* context) {
-  CreateQuotaManagerAndClients(context);
-  return UserDataAdapter<IndexedDBContext>::Get(
-      context, kIndexedDBContextKeyName);
+IndexedDBContext* BrowserContext::GetIndexedDBContext(
+    BrowserContext* browser_context) {
+  // TODO(ajwong): Change this API to require a process id instead of using
+  // kInvalidChildProcessId.
+  StoragePartition* partition =
+      GetStoragePartition(browser_context,
+                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return partition->indexed_db_context();
 }
 
-DatabaseTracker* BrowserContext::GetDatabaseTracker(BrowserContext* context) {
-  CreateQuotaManagerAndClients(context);
-  return UserDataAdapter<DatabaseTracker>::Get(
-      context, kDatabaseTrackerKeyName);
+DatabaseTracker* BrowserContext::GetDatabaseTracker(
+    BrowserContext* browser_context) {
+  // TODO(ajwong): Change this API to require a process id instead of using
+  // kInvalidChildProcessId.
+  StoragePartition* partition =
+      GetStoragePartition(browser_context,
+                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return partition->database_tracker();
 }
 
 AppCacheService* BrowserContext::GetAppCacheService(
     BrowserContext* browser_context) {
-  CreateQuotaManagerAndClients(browser_context);
-  return UserDataAdapter<ChromeAppCacheService>::Get(
-      browser_context, kAppCacheServicKeyName);
+  // TODO(ajwong): Change this API to require a process id instead of using
+  // kInvalidChildProcessId.
+  StoragePartition* partition =
+      GetStoragePartition(browser_context,
+                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return partition->appcache_service();
 }
 
 FileSystemContext* BrowserContext::GetFileSystemContext(
     BrowserContext* browser_context) {
-  CreateQuotaManagerAndClients(browser_context);
-  return UserDataAdapter<FileSystemContext>::Get(
-      browser_context, kFileSystemContextKeyName);
+  // TODO(ajwong): Change this API to require a process id instead of using
+  // kInvalidChildProcessId.
+  StoragePartition* partition =
+      GetStoragePartition(browser_context,
+                          ChildProcessHostImpl::kInvalidChildProcessId);
+  return partition->filesystem_context();
 }
 
 void BrowserContext::EnsureResourceContextInitialized(BrowserContext* context) {
   // This will be enough to tickle initialization of BrowserContext if
   // necessary, which initializes ResourceContext. The reason we don't call
   // ResourceContext::InitializeResourceContext directly here is that if
   // ResourceContext ends up initializing it will call back into BrowserContext
-  // and when that call return it'll end rewriting its UserData map (with the
+  // and when that call returns it'll end rewriting its UserData map (with the
   // same value) but this causes a race condition. See http://crbug.com/115678.
-  CreateQuotaManagerAndClients(context);
+  GetStoragePartition(context, ChildProcessHostImpl::kInvalidChildProcessId);
 }
 
 void BrowserContext::SaveSessionState(BrowserContext* browser_context) {
   GetDatabaseTracker(browser_context)->SetForceKeepSessionState();
 
   if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&SaveSessionStateOnIOThread,
                    browser_context->GetResourceContext()));
   }
 
-  GetDOMStorageContextImpl(browser_context)->SetForceKeepSessionState();
+  // TODO(ajwong): This is the only usage of GetDefaultDOMStorageContextImpl().
+  // After we migrate this to support multiple DOMStorageContexts, don't forget
+  // to remove the GetDefaultDOMStorageContextImpl() function as well.
+  GetDefaultDOMStorageContextImpl(browser_context)->SetForceKeepSessionState();
 
   if (BrowserThread::IsMessageLoopValid(BrowserThread::WEBKIT_DEPRECATED)) {
     IndexedDBContextImpl* indexed_db = static_cast<IndexedDBContextImpl*>(
         GetIndexedDBContext(browser_context));
     BrowserThread::PostTask(
         BrowserThread::WEBKIT_DEPRECATED, FROM_HERE,
         base::Bind(&SaveSessionStateOnWebkitThread,
                    make_scoped_refptr(indexed_db)));
   }
 }
 
 void BrowserContext::PurgeMemory(BrowserContext* browser_context) {
   if (BrowserThread::IsMessageLoopValid(BrowserThread::IO)) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&PurgeMemoryOnIOThread,
                    browser_context->GetResourceContext()));
   }
 
-  GetDOMStorageContextImpl(browser_context)->PurgeMemory();
+  ForEachDOMStorageContext(browser_context,
+                           base::Bind(&DOMStorageContextImpl::PurgeMemory));
 }
 
 BrowserContext::~BrowserContext() {
-  // These message loop checks are just to avoid leaks in unittests.
-  if (GetUserData(kDatabaseTrackerKeyName) &&
-      BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
-    BrowserThread::PostTask(
-        BrowserThread::FILE, FROM_HERE,
-        base::Bind(&webkit_database::DatabaseTracker::Shutdown,
-                   GetDatabaseTracker(this)));
-  }
-
-  if (GetUserData(kDOMStorageContextKeyName))
-    GetDOMStorageContextImpl(this)->Shutdown();
-
   if (GetUserData(kDownloadManagerKeyName))
     GetDownloadManager(this)->Shutdown();
 }
 
 }  // namespace content