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

webkit/browser/fileapi/quota/quota_backend_impl_unittest.cc

 // Copyright 2013 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/quota/quota_backend_impl.h"
 
 #include <string>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/browser/fileapi/file_system_usage_cache.h"
 #include "webkit/browser/fileapi/obfuscated_file_util.h"
-#include "webkit/browser/quota/quota_manager.h"
+#include "webkit/browser/quota/quota_manager_proxy.h"
 
 namespace fileapi {
 
 namespace {
 
 const char kOrigin[] = "http://example.com";
 
 bool DidReserveQuota(bool accepted,
                      base::PlatformFileError* error_out,
                      base::PlatformFileError error) {
@@ skipping 214 matching lines @@
   uint32 dirty = 0;
   ASSERT_TRUE(file_system_usage_cache_.GetDirty(path, &dirty));
   EXPECT_EQ(1u, dirty);
 
   backend_->DecrementDirtyCount(GURL(kOrigin), type);
   ASSERT_TRUE(file_system_usage_cache_.GetDirty(path, &dirty));
   EXPECT_EQ(0u, dirty);
 }
 
 }  // namespace fileapi