Use ScopedTaskEnvironment instead of MessageLoop in content unit tests.

content/browser/fileapi/sandbox_file_system_backend_delegate_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/sandbox_file_system_backend_delegate.h"
 
 #include <memory>
 
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/public/test/test_file_system_options.h"
 #include "storage/browser/fileapi/file_system_url.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 using storage::FileSystemURL;
 
 namespace content {
 
@@ skipping 17 matching lines @@
         NULL /* quota_manager_proxy */,
         base::ThreadTaskRunnerHandle::Get().get(), data_dir_.GetPath(),
         NULL /* special_storage_policy */, CreateAllowFileAccessOptions()));
   }
 
   bool IsAccessValid(const FileSystemURL& url) const {
     return delegate_->IsAccessValid(url);
   }
 
   base::ScopedTempDir data_dir_;
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<storage::SandboxFileSystemBackendDelegate> delegate_;
 };
 
 TEST_F(SandboxFileSystemBackendDelegateTest, IsAccessValid) {
   // Normal case.
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL("a")));
 
   // Access to a path with parent references ('..') should be disallowed.
   EXPECT_FALSE(IsAccessValid(CreateFileSystemURL("a/../b")));
 
@@ skipping 19 matching lines @@
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL(" .")));
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL(". ")));
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL("b.")));
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL(".b")));
 
   // A path that looks like a drive letter.
   EXPECT_TRUE(IsAccessValid(CreateFileSystemURL("c:")));
 }
 
 }  // namespace content