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

chrome/browser/browsing_data/browsing_data_quota_helper_unittest.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 "testing/gtest/include/gtest/gtest.h"
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "chrome/browser/browsing_data/browsing_data_quota_helper_impl.h"
 #include "content/public/test/test_browser_thread.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "webkit/browser/quota/mock_storage_client.h"
 #include "webkit/browser/quota/quota_manager.h"
+#include "webkit/browser/quota/quota_manager_proxy.h"
 
 using content::BrowserThread;
 
 class BrowsingDataQuotaHelperTest : public testing::Test {
  public:
   typedef BrowsingDataQuotaHelper::QuotaInfo QuotaInfo;
   typedef BrowsingDataQuotaHelper::QuotaInfoArray QuotaInfoArray;
 
   BrowsingDataQuotaHelperTest()
       : fetching_completed_(true),
@@ skipping 167 matching lines @@
   base::MessageLoop::current()->RunUntilIdle();
 
   GetPersistentHostQuota(kHost1);
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(0, quota());
 
   GetPersistentHostQuota(kHost2);
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(10, quota());
 }