Use ScopedTaskEnvironment instead of MessageLoop in storage unit tests.

storage/browser/fileapi/quota/quota_reservation_manager_unittest.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 <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "storage/browser/fileapi/quota/open_file_handle.h"
 #include "storage/browser/fileapi/quota/quota_reservation.h"
 #include "storage/browser/fileapi/quota/quota_reservation_manager.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using storage::kFileSystemTypeTemporary;
 using storage::OpenFileHandle;
 using storage::QuotaReservation;
 using storage::QuotaReservationManager;
@@ skipping 172 matching lines @@
     return static_cast<FakeBackend*>(reservation_manager_->backend_.get());
   }
 
   QuotaReservationManager* reservation_manager() {
     return reservation_manager_.get();
   }
 
   const base::FilePath& file_path() const { return file_path_; }
 
  private:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::ScopedTempDir work_dir_;
   base::FilePath file_path_;
   std::unique_ptr<QuotaReservationManager> reservation_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(QuotaReservationManagerTest);
 };
 
 TEST_F(QuotaReservationManagerTest, BasicTest) {
   scoped_refptr<QuotaReservation> reservation =
       reservation_manager()->CreateReservation(GURL(kOrigin), kType);
@@ skipping 136 matching lines @@
 
   EXPECT_EQ(kInitialFileSize + 10, GetFileSize(file_path()));
   EXPECT_EQ(kInitialFileSize + 15 + 20, fake_backend()->on_memory_usage());
   EXPECT_EQ(kInitialFileSize + 10, fake_backend()->on_disk_usage());
 
   reservation2 = NULL;
   EXPECT_EQ(kInitialFileSize + 10, fake_backend()->on_memory_usage());
 }
 
 }  // namespace content