Split file_observers.h into three files for each class

webkit/browser/fileapi/sandbox_quota_observer.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 WEBKIT_BROWSER_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_
 #define WEBKIT_BROWSER_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "webkit/browser/fileapi/file_observers.h"
+#include "webkit/browser/fileapi/file_access_observer.h"
 #include "webkit/browser/fileapi/file_system_url.h"
+#include "webkit/browser/fileapi/file_update_observer.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace quota {
 class QuotaManagerProxy;
 }
 
 namespace fileapi {
@@ skipping 45 matching lines @@
 
   PendingUpdateNotificationMap pending_update_notification_;
   scoped_ptr<TimedTaskHelper> delayed_cache_update_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(SandboxQuotaObserver);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_SANDBOX_QUOTA_OBSERVER_H_