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

storage/browser/test/mock_storage_client.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/public/test/mock_storage_client.h"
+#include "storage/browser/test/mock_storage_client.h"
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/singleton.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "net/base/url_util.h"
@@ skipping 166 matching lines @@
     int64_t delta = itr->second;
     quota_manager_proxy_->
         NotifyStorageModified(id(), origin_url, type, -delta);
     origin_data_.erase(itr);
   }
 
   callback.Run(kQuotaStatusOk);
 }
 
 }  // namespace content