Use ScopedTaskEnvironment instead of MessageLoop in content unit tests.

content/renderer/gpu/queue_message_swap_promise_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 "content/renderer/gpu/queue_message_swap_promise.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/test/scoped_task_environment.h"
 #include "cc/output/swap_promise.h"
 #include "content/renderer/gpu/frame_swap_message_queue.h"
 #include "content/renderer/gpu/render_widget_compositor.h"
 #include "content/renderer/render_widget.h"
 #include "content/test/mock_render_process.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "ipc/ipc_test_sink.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 96 matching lines @@
         promise->WillSwap(NULL);
         promise->DidSwap();
       }
     }
   }
 
  protected:
   void VisualStateSwapPromiseDidNotSwap(
       cc::SwapPromise::DidNotSwapReason reason);
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;
   scoped_refptr<TestSyncMessageFilter> sync_message_filter_;
   std::vector<IPC::Message> messages_;
   std::vector<std::unique_ptr<cc::SwapPromise>> promises_;
 
  private:
   std::vector<std::unique_ptr<IPC::Message>> next_swap_messages_;
 
   DISALLOW_COPY_AND_ASSIGN(QueueMessageSwapPromiseTest);
 };
@@ skipping 177 matching lines @@
 TEST_F(QueueMessageSwapPromiseTest, VisualStateSwapPromiseDidNotSwapSwapFails) {
   VisualStateSwapPromiseDidNotSwap(cc::SwapPromise::SWAP_FAILS);
 }
 
 TEST_F(QueueMessageSwapPromiseTest,
        VisualStateSwapPromiseDidNotSwapActivationFails) {
   VisualStateSwapPromiseDidNotSwap(cc::SwapPromise::ACTIVATION_FAILS);
 }
 
 }  // namespace content