Remove calls to deprecated MessageLoop methods in content.

content/renderer/gpu/render_widget_compositor_unittest.cc

Index: content/renderer/gpu/render_widget_compositor_unittest.cc
diff --git a/content/renderer/gpu/render_widget_compositor_unittest.cc b/content/renderer/gpu/render_widget_compositor_unittest.cc
index 6dae54c12f7dec51026f9af9ae917dffdb3b919a..23a3a01faaf873169a988d0d860e54eebb852f35 100644
--- a/content/renderer/gpu/render_widget_compositor_unittest.cc
+++ b/content/renderer/gpu/render_widget_compositor_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/begin_frame_args.h"
@@ -240,7 +241,7 @@ class RenderWidgetCompositorOutputSurfaceTest : public testing::Test {
         FROM_HERE,
         base::Bind(&RenderWidgetCompositorOutputSurface::SynchronousComposite,
                    base::Unretained(&render_widget_compositor_)));
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
     render_widget_compositor_.AfterTest();
   }