Use ScopedTaskEnvironment instead of MessageLoopForUI in chrome tests.

chrome/browser/ui/views/frame/web_contents_close_handler_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 "chrome/browser/ui/views/frame/web_contents_close_handler.h"
 
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "chrome/browser/ui/views/frame/web_contents_close_handler_delegate.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class MockWebContentsCloseHandlerDelegate
     : public WebContentsCloseHandlerDelegate {
  public:
   explicit MockWebContentsCloseHandlerDelegate()
-      : got_clone_(false),
-        got_destroy_(false) {
-  }
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI),
+        got_clone_(false),
+        got_destroy_(false) {}
   ~MockWebContentsCloseHandlerDelegate() override {}
 
   void Clear() {
     got_clone_ = got_destroy_ = false;
   }
 
   bool got_clone() const { return got_clone_; }
   void clear_got_clone() { got_clone_ = false; }
 
   bool got_destroy() const { return got_destroy_; }
   void clear_got_destroy() { got_destroy_ = false; }
 
   // WebContentsCloseHandlerDelegate:
   void CloneWebContentsLayer() override { got_clone_ = true; }
   void DestroyClonedLayer() override { got_destroy_ = true; }
 
  private:
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   bool got_clone_;
   bool got_destroy_;
 
   DISALLOW_COPY_AND_ASSIGN(MockWebContentsCloseHandlerDelegate);
 };
 
 // -----------------------------------------------------------------------------
 
 class WebContentsCloseHandlerTest : public testing::Test {
  public:
@@ skipping 36 matching lines @@
 
 // Verifies the timer is started after a close.
 TEST_F(WebContentsCloseHandlerTest, DontDestroyImmediatleyAfterCancel) {
   close_handler_.WillCloseAllTabs();
   close_handler_delegate_.Clear();
   close_handler_.CloseAllTabsCanceled();
   EXPECT_FALSE(close_handler_delegate_.got_destroy());
   EXPECT_FALSE(close_handler_delegate_.got_clone());
   EXPECT_TRUE(IsTimerRunning());
 }
-