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

ppapi/tests/test_graphics_2d.cc

 // Copyright (c) 2012 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 "ppapi/tests/test_graphics_2d.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include <set>
@@ skipping 635 matching lines @@
     is_view_changed_ = true;
     testing_interface_->QuitMessageLoop(instance_->pp_instance());
   }
 }
 
 void TestGraphics2D::ResetViewChangedState() {
   is_view_changed_ = false;
 }
 
 bool TestGraphics2D::WaitUntilViewChanged() {
-  // Run a nested message loop. It will exit either on ViewChanged or if the
+  // Run a nested run loop. It will exit either on ViewChanged or if the
   // timeout happens.
 
   // If view changed before we have chance to run message loop, return directly.
   if (is_view_changed_)
     return true;
 
   post_quit_on_view_changed_ = true;
   testing_interface_->RunMessageLoop(instance_->pp_instance());
   post_quit_on_view_changed_ = false;
 
@@ skipping 130 matching lines @@
   pp::Graphics2D dc(instance_, pp::Size(w, h), false);
   ASSERT_FALSE(dc.is_null());
   ASSERT_TRUE(instance_->BindGraphics(dc));
 
   ASSERT_TRUE(instance_->BindGraphics(pp::Graphics2D()));
   ASSERT_TRUE(instance_->BindGraphics(pp::Graphics3D()));
 
   PASS();
 }