Move storage quota unit tests and test doubles next to the files they cover.

storage/browser/test/mock_quota_manager.cc

 // Copyright 2014 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 "content/browser/quota/mock_quota_manager.h"
+#include "storage/browser/test/mock_quota_manager.h"
 
 #include <limits>
 #include <memory>
 
 #include "base/location.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "url/gurl.h"
 
@@ skipping 125 matching lines @@
   callback.Run(*origins, storage_type);
 }
 
 void MockQuotaManager::DidDeleteOriginData(
     const StatusCallback& callback,
     QuotaStatusCode status) {
   callback.Run(status);
 }
 
 }  // namespace content