Use ScopedTaskEnvironment instead of MessageLoop in content unit tests.

content/browser/fileapi/file_system_context_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 "storage/browser/fileapi/file_system_context.h"
 
 #include <stddef.h>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "content/browser/quota/mock_quota_manager.h"
 #include "content/public/test/mock_special_storage_policy.h"
 #include "content/public/test/test_file_system_options.h"
 #include "storage/browser/fileapi/external_mount_points.h"
 #include "storage/browser/fileapi/file_system_backend.h"
 #include "storage/browser/fileapi/isolated_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 67 matching lines @@
     EXPECT_EQ(expect_origin, url.origin());
     EXPECT_EQ(expect_mount_type, url.mount_type());
     EXPECT_EQ(expect_type, url.type());
     EXPECT_EQ(expect_path, url.path());
     EXPECT_EQ(expect_virtual_path, url.virtual_path());
     EXPECT_EQ(expect_filesystem_id, url.filesystem_id());
   }
 
  private:
   base::ScopedTempDir data_dir_;
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   scoped_refptr<storage::SpecialStoragePolicy> storage_policy_;
   scoped_refptr<MockQuotaManager> mock_quota_manager_;
 };
 
 // It is not valid to pass NULL ExternalMountPoints to FileSystemContext on
 // ChromeOS.
 #if !defined(OS_CHROMEOS)
 TEST_F(FileSystemContextTest, NullExternalMountPoints) {
   scoped_refptr<FileSystemContext> file_system_context(
       CreateFileSystemContextForTest(NULL));
@@ skipping 272 matching lines @@
       storage::kFileSystemTypeForTransientFile));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeNativeLocal));
   EXPECT_TRUE(file_system_context->GetFileSystemBackend(
       storage::kFileSystemTypeNativeForPlatformApp));
 }
 
 }  // namespace
 
 }  // namespace content