Cleanup: Remove unneeded forward declarations in webkit/.

webkit/fileapi/file_system_file_util_proxy.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 WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/callback_old.h"
 #include "base/file_path.h"
 #include "base/file_util_proxy.h"
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 #include "base/tracked_objects.h"
 
 namespace base {
 class MessageLoopProxy;
-class Time;
 }
 
 namespace fileapi {
 
-class FileSystemOperationContext;
-
 using base::MessageLoopProxy;
 using base::PlatformFile;
 using base::PlatformFileError;
 using base::PlatformFileInfo;
 
 // This class provides relay methods for supporting asynchronous access to
 // FileSystem API operations.  (Most of necessary relay methods are provided
 // by base::FileUtilProxy, but there are a few operations that are not
 // covered or are slightly different from the version of base::FileUtilProxy.
 class FileSystemFileUtilProxy {
@@ skipping 37 matching lines @@
       const ReadDirectoryTask& task,
       const ReadDirectoryCallback& callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemFileUtilProxy);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_PROXY_H_