Use ScopedTaskEnvironment instead of MessageLoop in RenderViewTest.

content/public/test/render_view_test.cc

Index: content/public/test/render_view_test.cc
diff --git a/content/public/test/render_view_test.cc b/content/public/test/render_view_test.cc
index e04ab92c730ea71ff925a9415a3d9207f1aed6e1..aee7cdfb21d1f101fc74b23a3772a6a3565ca41d 100644
--- a/content/public/test/render_view_test.cc
+++ b/content/public/test/render_view_test.cc
@@ -156,12 +156,6 @@ RenderViewTest::RenderViewTest()
 RenderViewTest::~RenderViewTest() {
 }
 
-void RenderViewTest::ProcessPendingMessages() {
-  msg_loop_.task_runner()->PostTask(FROM_HERE,
-                                    base::MessageLoop::QuitWhenIdleClosure());
-  base::RunLoop().Run();
-}
-
 WebLocalFrame* RenderViewTest::GetMainFrame() {
   return view_->GetWebView()->MainFrame()->ToWebLocalFrame();
 }
@@ -322,7 +316,7 @@ void RenderViewTest::SetUp() {
 
 void RenderViewTest::TearDown() {
   // Run the loop so the release task from the renderwidget executes.
-  ProcessPendingMessages();
+  base::RunLoop().RunUntilIdle();
 
   render_thread_->SendCloseMessage();