Use ScopedTaskEnvironment instead of MessageLoopForUI in ui tests.

ui/gfx/animation/animation_unittest.cc

 // Copyright (c) 2011 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 "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/linear_animation.h"
 #include "ui/gfx/animation/test_animation_delegate.h"
 
 #if defined(OS_WIN)
+#include "base/test/scoped_task_environment.h"
 #include "base/win/windows_version.h"
 #endif
 
 namespace gfx {
 
 class AnimationTest: public testing::Test {
+ protected:
+  AnimationTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
+
  private:
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 };
 
 namespace {
 
 ///////////////////////////////////////////////////////////////////////////////
 // RunAnimation
 
 class RunAnimation : public LinearAnimation {
  public:
   RunAnimation(int frame_rate, AnimationDelegate* delegate)
@@ skipping 119 matching lines @@
   EXPECT_EQ(0.0, animation.GetCurrentValue());
   animation.Start();
   EXPECT_EQ(0.0, animation.GetCurrentValue());
   animation.End();
   EXPECT_EQ(1.0, animation.GetCurrentValue());
   animation.Start();
   EXPECT_EQ(0.0, animation.GetCurrentValue());
 }
 
 }  // namespace gfx