Fix gdata includes.

chrome/browser/chromeos/gdata/gdata_wapi_feed_loader.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 CHROME_BROWSER_CHROMEOS_GDATA_GDATA_WAPI_FEED_LOADER_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_WAPI_FEED_LOADER_H_
 
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/gdata/gdata_directory_service.h"
 #include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
 
+class GURL;
+
+namespace base {
+class Value;
+}
+
 namespace gdata {
 
 class DriveWebAppsRegistryInterface;
+class DocumentFeed;
 class DocumentsServiceInterface;
 class GDataCache;
 struct GetDocumentsUiState;
 
 // Set of parameters sent to LoadDocumentFeedCallback callback.
 struct GetDocumentsParams {
   GetDocumentsParams(int64 start_changestamp,
                      int64 root_feed_changestamp,
                      std::vector<DocumentFeed*>* feed_list,
                      bool should_fetch_multiple_feeds,
@@ skipping 218 matching lines @@
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<GDataWapiFeedLoader> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(GDataWapiFeedLoader);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_WAPI_FEED_LOADER_H_