[ew] Move operation observers from QuotaUtil to FileSystemBackend.

storage/browser/fileapi/plugin_private_file_system_backend.cc

 // Copyright 2013 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.
 
 #include "storage/browser/fileapi/plugin_private_file_system_backend.h"
 
 #include <map>
 
 #include "base/stl_util.h"
 #include "base/synchronization/lock.h"
@@ skipping 255 matching lines @@
 
 scoped_refptr<QuotaReservation>
 PluginPrivateFileSystemBackend::CreateQuotaReservationOnFileTaskRunner(
     const GURL& origin_url,
     FileSystemType type) {
   // We don't track usage on this filesystem.
   NOTREACHED();
   return scoped_refptr<QuotaReservation>();
 }
 
-void PluginPrivateFileSystemBackend::AddFileUpdateObserver(
-    FileSystemType type,
-    FileUpdateObserver* observer,
-    base::SequencedTaskRunner* task_runner) {}
-
-void PluginPrivateFileSystemBackend::AddFileChangeObserver(
-    FileSystemType type,
-    FileChangeObserver* observer,
-    base::SequencedTaskRunner* task_runner) {}
-
-void PluginPrivateFileSystemBackend::AddFileAccessObserver(
-    FileSystemType type,
-    FileAccessObserver* observer,
-    base::SequencedTaskRunner* task_runner) {}
-
 const UpdateObserverList* PluginPrivateFileSystemBackend::GetUpdateObservers(
     FileSystemType type) const {
   return NULL;
 }
 
 const ChangeObserverList* PluginPrivateFileSystemBackend::GetChangeObservers(
     FileSystemType type) const {
   return NULL;
 }
 
 const AccessObserverList* PluginPrivateFileSystemBackend::GetAccessObservers(
     FileSystemType type) const {
   return NULL;
 }
 
 ObfuscatedFileUtil* PluginPrivateFileSystemBackend::obfuscated_file_util() {
   return static_cast<ObfuscatedFileUtil*>(
       static_cast<AsyncFileUtilAdapter*>(file_util_.get())->sync_file_util());
 }
 
 }  // namespace storage