[ew] Move operation observers from QuotaUtil to FileSystemBackend.

storage/browser/fileapi/file_system_context.cc

 // 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.
 
 #include "storage/browser/fileapi/file_system_context.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/task_runner_util.h"
@@ skipping 275 matching lines @@
 }
 
 bool FileSystemContext::IsSandboxFileSystem(FileSystemType type) const {
   FileSystemBackendMap::const_iterator found = backend_map_.find(type);
   return found != backend_map_.end() && found->second->GetQuotaUtil();
 }
 
 const UpdateObserverList* FileSystemContext::GetUpdateObservers(
     FileSystemType type) const {
   FileSystemBackend* backend = GetFileSystemBackend(type);
-  if (backend->GetQuotaUtil())
-    return backend->GetQuotaUtil()->GetUpdateObservers(type);
-  return NULL;
+  return backend->GetUpdateObservers(type);
 }
 
 const ChangeObserverList* FileSystemContext::GetChangeObservers(
     FileSystemType type) const {
   FileSystemBackend* backend = GetFileSystemBackend(type);
-  if (backend->GetQuotaUtil())
-    return backend->GetQuotaUtil()->GetChangeObservers(type);
-  return NULL;
+  return backend->GetChangeObservers(type);
 }
 
 const AccessObserverList* FileSystemContext::GetAccessObservers(
     FileSystemType type) const {
   FileSystemBackend* backend = GetFileSystemBackend(type);
-  if (backend->GetQuotaUtil())
-    return backend->GetQuotaUtil()->GetAccessObservers(type);
-  return NULL;
+  return backend->GetAccessObservers(type);
 }
 
 void FileSystemContext::GetFileSystemTypes(
     std::vector<FileSystemType>* types) const {
   types->clear();
   for (FileSystemBackendMap::const_iterator iter = backend_map_.begin();
        iter != backend_map_.end(); ++iter)
     types->push_back(iter->first);
 }
 
@@ skipping 310 matching lines @@
   } else if (parent != child) {
     bool result = parent.AppendRelativePath(child, &path);
     DCHECK(result);
   }
 
   operation_runner()->GetMetadata(
       url, base::Bind(&DidGetMetadataForResolveURL, path, callback, info));
 }
 
 }  // namespace storage