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

content/public/test/test_frame_navigation_observer.h

 // Copyright 2014 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_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_
 #define CONTENT_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/test/browser_test_utils.h"
 
 namespace content {
 
 // Helper for waiting until the navigation in a specific frame tree node (and
 // all of its subframes) has completed loading.
 class TestFrameNavigationObserver : public WebContentsObserver {
  public:
   // Create and register a new TestFrameNavigationObserver which will track
   // navigations performed in the frame tree node associated with |adapter|.
   // Note that RenderFrameHost associated with |frame| might be destroyed during
   // the navigation (e.g. if the content commits in a new renderer process).
   explicit TestFrameNavigationObserver(const ToRenderFrameHost& adapter);
 
   ~TestFrameNavigationObserver() override;
 
-  // Runs a nested message loop and blocks until the full load has
+  // Runs a nested run loop and blocks until the full load has
   // completed.
   void Wait();
 
-  // Runs a nested message loop and blocks until the navigation in the
+  // Runs a nested run loop and blocks until the navigation in the
   // associated FrameTreeNode has committed.
   void WaitForCommit();
 
  private:
   // WebContentsObserver
   void DidStartNavigation(NavigationHandle* navigation_handle) override;
   void DidFinishNavigation(NavigationHandle* navigation_handle) override;
   void DidStopLoading() override;
 
   // The id of the FrameTreeNode in which navigations are peformed.
@@ skipping 11 matching lines @@
 
   // The RunLoop used to spin the message loop.
   base::RunLoop run_loop_;
 
   DISALLOW_COPY_AND_ASSIGN(TestFrameNavigationObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_FRAME_NAVIGATION_OBSERVER_H_