Use the DatabaseTracker only on the FILE thread.

chrome/browser/browsing_data_database_helper.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_BROWSING_DATA_DATABASE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_DATABASE_HELPER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/database/database_tracker.h"
 
 class Profile;
 
-// This class fetches database information in the WEBKIT thread, and notifies
+// This class fetches database information in the FILE thread, and notifies
 // the UI thread upon completion.
 // A client of this class need to call StartFetching from the UI thread to
 // initiate the flow, and it'll be notified by the callback in its UI
 // thread at some later point.
 // The client must call CancelNotification() if it's destroyed before the
 // callback is notified.
 class BrowsingDataDatabaseHelper
     : public base::RefCountedThreadSafe<BrowsingDataDatabaseHelper> {
  public:
   // Contains detailed information about a web database.
@@ skipping 25 matching lines @@
   // callback.
   // This must be called only in the UI thread.
   virtual void StartFetching(
       Callback1<const std::vector<DatabaseInfo>& >::Type* callback);
 
   // Cancels the notification callback (i.e., the window that created it no
   // longer exists).
   // This must be called only in the UI thread.
   virtual void CancelNotification();
 
-  // Requests a single database to be deleted in the WEBKIT thread. This must be
+  // Requests a single database to be deleted in the FILE thread. This must be
   // called in the UI thread.
   virtual void DeleteDatabase(const std::string& origin,
                               const std::string& name);
 
  protected:
   friend class base::RefCountedThreadSafe<BrowsingDataDatabaseHelper>;
   virtual ~BrowsingDataDatabaseHelper();
 
   // Notifies the completion callback. This must be called in the UI thread.
   void NotifyInUIThread();
 
-  // This only mutates in the WEBKIT thread.
+  // This only mutates in the FILE thread.
   std::vector<DatabaseInfo> database_info_;
 
   // This only mutates on the UI thread.
   scoped_ptr<Callback1<const std::vector<DatabaseInfo>& >::Type >
       completion_callback_;
 
   // Indicates whether or not we're currently fetching information:
   // it's true when StartFetching() is called in the UI thread, and it's reset
   // after we notify the callback in the UI thread.
   // This only mutates on the UI thread.
   bool is_fetching_;
 
  private:
-  // Enumerates all databases. This must be called in the WEBKIT thread.
-  void FetchDatabaseInfoInWebKitThread();
+  // Enumerates all databases. This must be called in the FILE thread.
+  void FetchDatabaseInfoOnFileThread();
 
-  // Delete a single database file. This must be called in the WEBKIT thread.
-  void DeleteDatabaseInWebKitThread(const std::string& origin,
+  // Delete a single database file. This must be called in the FILE thread.
+  void DeleteDatabaseOnFileThread(const std::string& origin,
                                   const std::string& name);
 
   scoped_refptr<webkit_database::DatabaseTracker> tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataDatabaseHelper);
 };
 
 // This class is a thin wrapper around BrowsingDataDatabaseHelper that does not
 // fetch its information from the database tracker, but gets them passed as
 // a parameter during construction.
@@ skipping 46 matching lines @@
 
   // This may mutate on WEBKIT and UI threads.
   std::vector<PendingDatabaseInfo> pending_database_info_;
 
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(CannedBrowsingDataDatabaseHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_DATABASE_HELPER_H_