Use a direct include of the message_loop header in webkit/, part 1.

webkit/browser/fileapi/file_system_usage_cache_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 "webkit/browser/fileapi/file_system_usage_cache.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace fileapi {
 
 class FileSystemUsageCacheTest : public testing::Test {
  public:
   FileSystemUsageCacheTest()
       : usage_cache_(base::MessageLoopProxy::current().get()) {}
 
   virtual void SetUp() {
@@ skipping 128 matching lines @@
   base::FilePath usage_file_path = GetUsageFilePath();
   EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
 }
 
 TEST_F(FileSystemUsageCacheTest, DecrementDirtyWithoutCacheFileTest) {
   base::FilePath usage_file_path = GetUsageFilePath();
   EXPECT_FALSE(usage_cache()->IncrementDirty(usage_file_path));
 }
 
 }  // namespace fileapi