Quota: Factor out (Mock)QuotaManagerProxy into its own file for readability

webkit/browser/fileapi/sandbox_quota_observer.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 "webkit/browser/fileapi/sandbox_quota_observer.h"
 
 #include "base/sequenced_task_runner.h"
 #include "webkit/browser/fileapi/file_system_url.h"
 #include "webkit/browser/fileapi/file_system_usage_cache.h"
 #include "webkit/browser/fileapi/sandbox_file_system_backend_delegate.h"
 #include "webkit/browser/fileapi/timed_task_helper.h"
 #include "webkit/browser/quota/quota_client.h"
-#include "webkit/browser/quota/quota_manager.h"
+#include "webkit/browser/quota/quota_manager_proxy.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace fileapi {
 
 SandboxQuotaObserver::SandboxQuotaObserver(
     quota::QuotaManagerProxy* quota_manager_proxy,
     base::SequencedTaskRunner* update_notify_runner,
     ObfuscatedFileUtil* sandbox_file_util,
     FileSystemUsageCache* file_system_usage_cache)
     : quota_manager_proxy_(quota_manager_proxy),
@@ skipping 106 matching lines @@
 
 void SandboxQuotaObserver::UpdateUsageCacheFile(
     const base::FilePath& usage_file_path,
     int64 delta) {
   DCHECK(!usage_file_path.empty());
   if (!usage_file_path.empty() && delta != 0)
     file_system_usage_cache_->AtomicUpdateUsageByDelta(usage_file_path, delta);
 }
 
 }  // namespace fileapi