storage: Cleanup class/struct forward declarations

storage/browser/fileapi/obfuscated_file_util.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 STORAGE_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_
 #define STORAGE_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 10 matching lines @@
 #include "storage/browser/blob/shareable_file_reference.h"
 #include "storage/browser/fileapi/file_system_file_util.h"
 #include "storage/browser/fileapi/file_system_url.h"
 #include "storage/browser/fileapi/sandbox_directory_database.h"
 #include "storage/browser/fileapi/sandbox_file_system_backend_delegate.h"
 #include "storage/browser/storage_browser_export.h"
 #include "storage/common/fileapi/file_system_types.h"
 
 namespace base {
 class SequencedTaskRunner;
-class TimeTicks;
 }
 
 namespace content {
 class ObfuscatedFileUtilTest;
 class QuotaBackendImplTest;
 }
 
 namespace storage {
 class SpecialStoragePolicy;
 }
@@ skipping 302 matching lines @@
 
   // Not owned.
   SandboxFileSystemBackendDelegate* sandbox_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ObfuscatedFileUtil);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_OBFUSCATED_FILE_UTIL_H_