Replace "nested message loop" with "nested run loop" in comments.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 713ba4f07d40a9461235244780719850cfa359b8..49e16341e3d7677755d75b3f79be44a9b7337633 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -929,7 +929,7 @@ void RenderWidgetHostImpl::WaitForSurface() {
     Send(new ViewMsg_Repaint(routing_id_, view_size));
   }
 
-  // Pump a nested message loop until we time out or get a frame of the right
+  // Pump a nested run loop until we time out or get a frame of the right
   // size.
   TimeTicks start_time = TimeTicks::Now();
   TimeDelta time_left = TimeDelta::FromMilliseconds(kPaintMsgTimeoutMS);