Use ScopedTaskEnvironment instead of MessageLoop in content unit tests.

content/browser/fileapi/recursive_operation_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/recursive_operation_delegate.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.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 "content/public/test/sandbox_file_system_test_helper.h"
 #include "storage/browser/fileapi/file_system_file_util.h"
 #include "storage/browser/fileapi/file_system_operation.h"
 #include "storage/browser/fileapi/file_system_operation_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using storage::FileSystemContext;
 using storage::FileSystemOperationContext;
 using storage::FileSystemURL;
@@ skipping 155 matching lines @@
 
   FileSystemURL CreateDirectory(const std::string& path) {
     FileSystemURL url = URLForPath(path);
     EXPECT_EQ(base::File::FILE_OK,
               file_util()->CreateDirectory(NewContext().get(), url,
                                            false /* exclusive */, true));
     return url;
   }
 
  private:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   // Common temp base for nondestructive uses.
   base::ScopedTempDir base_;
   SandboxFileSystemTestHelper sandbox_file_system_;
 };
 
 TEST_F(RecursiveOperationDelegateTest, RootIsFile) {
   FileSystemURL src_file(CreateFile("src"));
 
   base::File::Error error = base::File::FILE_ERROR_FAILED;
@@ skipping 175 matching lines @@
   EXPECT_EQ(LoggingRecursiveOperation::LogEntry::POST_PROCESS_DIRECTORY,
             log_entries[6].type);
   EXPECT_EQ(src_dir1, log_entries[6].url);
 
   EXPECT_EQ(LoggingRecursiveOperation::LogEntry::POST_PROCESS_DIRECTORY,
             log_entries[7].type);
   EXPECT_EQ(src_root, log_entries[7].url);
 }
 
 }  // namespace content