content: Cleanup class/struct forward declarations

content/public/browser/browser_context.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 35 matching lines @@
 class SpecialStoragePolicy;
 }
 
 namespace content {
 
 class BackgroundSyncController;
 class BlobHandle;
 class BrowserPluginGuestManager;
 class DownloadManager;
 class DownloadManagerDelegate;
-class IndexedDBContext;
 class PermissionManager;
 class PushMessagingService;
 class ResourceContext;
 class ServiceManagerConnection;
 class SiteInstance;
 class StoragePartition;
 class SSLHostStateDelegate;
 
 // A mapping from the scheme name to the protocol handler that services its
 // content.
@@ skipping 176 matching lines @@
   // called only once per partition_path.
   virtual net::URLRequestContextGetter*
       CreateMediaRequestContextForStoragePartition(
           const base::FilePath& partition_path,
           bool in_memory) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_