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

chrome/browser/extensions/api/web_navigation/web_navigation_apitest.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 <list>
 #include <set>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 256 matching lines @@
   ~StartProvisionalLoadObserver() override {}
 
   void DidStartNavigation(
       content::NavigationHandle* navigation_handle) override {
     if (navigation_handle->GetURL() == url_) {
       url_seen_ = true;
       message_loop_runner_->Quit();
     }
   }
 
-  // Run a nested message loop until navigation to the expected URL has started.
+  // Run a nested run loop until navigation to the expected URL has started.
   void Wait() {
     if (url_seen_)
       return;
 
     message_loop_runner_->Run();
   }
 
  private:
   GURL url_;
   bool url_seen_;
@@ skipping 521 matching lines @@
           "extensions/api_test/webnavigation/crash/b.html",
       embedded_test_server()->port()));
   ui_test_utils::NavigateToURL(browser(), url);
 
   ASSERT_TRUE(catcher.GetNextResult()) << catcher.message();
 }
 
 #endif
 
 }  // namespace extensions