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

content/public/test/test_navigation_observer.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 #define CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 15 matching lines @@
                          int number_of_navigations,
                          MessageLoopRunner::QuitMode quit_mode =
                              MessageLoopRunner::QuitMode::IMMEDIATE);
   // Like above but waits for one navigation.
   explicit TestNavigationObserver(WebContents* web_contents,
                                   MessageLoopRunner::QuitMode quit_mode =
                                       MessageLoopRunner::QuitMode::IMMEDIATE);
 
   virtual ~TestNavigationObserver();
 
-  // Runs a nested message loop and blocks until the expected number of
+  // Runs a nested run loop and blocks until the expected number of
   // navigations are complete.
   void Wait();
 
   // Start/stop watching newly created WebContents.
   void StartWatchingNewWebContents();
   void StopWatchingNewWebContents();
 
   const GURL& last_navigation_url() const { return last_navigation_url_; }
 
   int last_navigation_succeeded() const { return last_navigation_succeeded_; }
@@ skipping 42 matching lines @@
 
   // Living TestWebContentsObservers created by this observer.
   std::set<std::unique_ptr<TestWebContentsObserver>> web_contents_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestNavigationObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_NAVIGATION_OBSERVER_H_