Remove calls to deprecated MessageLoop methods in content.

content/browser/frame_host/render_widget_host_view_guest_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/browser/frame_host/render_widget_host_view_guest.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "build/build_config.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_manager.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/compositor/test/no_transport_image_transport_factory.h"
 #include "content/browser/gpu/compositor_util.h"
 #include "content/browser/renderer_host/render_widget_host_delegate.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
@@ skipping 42 matching lines @@
         (new TestRenderWidgetHostView(widget_host_))->GetWeakPtr());
   }
 
   void TearDown() override {
     if (view_)
       view_->Destroy();
     delete widget_host_;
 
     browser_context_.reset();
 
-    message_loop_.DeleteSoon(FROM_HERE, browser_context_.release());
+    message_loop_.task_runner()->DeleteSoon(FROM_HERE,
+                                            browser_context_.release());
     message_loop_.RunUntilIdle();
 #if !defined(OS_ANDROID)
     ImageTransportFactory::Terminate();
 #endif
   }
 
  protected:
   base::MessageLoopForUI message_loop_;
   std::unique_ptr<BrowserContext> browser_context_;
   MockRenderWidgetHostDelegate delegate_;
@@ skipping 196 matching lines @@
 
   browser_plugin_guest_->set_attached(false);
   browser_plugin_guest_->ResetTestData();
 
   view_->OnSwapCompositorFrame(
       0, CreateDelegatedFrame(scale_factor, view_size, view_rect));
   EXPECT_TRUE(surface_id().is_null());
 }
 
 }  // namespace content