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

content/browser/site_per_process_browsertest.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 "content/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 429 matching lines @@
  public:
   RenderFrameHostCreatedObserver(WebContents* web_contents,
                                  int expected_frame_count)
       : WebContentsObserver(web_contents),
         expected_frame_count_(expected_frame_count),
         frames_created_(0),
         message_loop_runner_(new MessageLoopRunner) {}
 
   ~RenderFrameHostCreatedObserver() override;
 
-  // Runs a nested message loop and blocks until the expected number of
+  // Runs a nested run loop and blocks until the expected number of
   // RenderFrameHosts is created.
   void Wait();
 
  private:
   // WebContentsObserver
   void RenderFrameCreated(RenderFrameHost* render_frame_host) override;
 
   // The number of RenderFrameHosts to wait for.
   int expected_frame_count_;
 
@@ skipping 9703 matching lines @@
     names.insert(root->children[0]->frame_entry->frame_unique_name());
   }
 
   // More than one entry in the set means that the subframe frame navigation
   // entries didn't have a consistent unique name. This will break history
   // navigations =(
   EXPECT_THAT(names, SizeIs(1)) << "Mismatched names for subframe!";
 }
 
 }  // namespace content