Use ScopedTaskEnvironment instead of MessageLoopForUI in ui tests.

ui/base/ime/chromeos/ime_keyboard_x11_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 "ui/base/ime/chromeos/ime_keyboard.h"
 
 #include <X11/Xlib.h>
 
 #include <algorithm>
 #include <memory>
 #include <set>
 #include <string>
 
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace chromeos {
 namespace input_method {
 
 namespace {
 
 class ImeKeyboardTest : public testing::Test,
                         public ImeKeyboard::Observer {
  public:
-  ImeKeyboardTest() {
-  }
+  ImeKeyboardTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
 
   void SetUp() override {
     xkey_.reset(ImeKeyboard::Create());
     xkey_->AddObserver(this);
     caps_changed_ = false;
   }
 
   void TearDown() override {
     xkey_->RemoveObserver(this);
     xkey_.reset();
   }
 
   void OnCapsLockChanged(bool enabled) override {
     caps_changed_ = true;
   }
 
   void VerifyCapsLockChanged(bool changed) {
     EXPECT_EQ(changed, caps_changed_);
     caps_changed_ = false;
   }
 
   std::unique_ptr<ImeKeyboard> xkey_;
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   bool caps_changed_;
 };
 
 // Returns true if X display is available.
 bool DisplayAvailable() {
   return gfx::GetXDisplay() != NULL;
 }
 
 }  // namespace
 
@@ skipping 85 matching lines @@
 
   // Restore the initial state.
   EXPECT_TRUE(xkey_->SetAutoRepeatRate(rate));
   EXPECT_TRUE(ImeKeyboard::GetAutoRepeatRateForTesting(&tmp));
   EXPECT_EQ(rate.initial_delay_in_ms, tmp.initial_delay_in_ms);
   EXPECT_EQ(rate.repeat_interval_in_ms, tmp.repeat_interval_in_ms);
 }
 
 }  // namespace input_method
 }  // namespace chromeos