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

base/run_loop.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 BASE_RUN_LOOP_H_
 #define BASE_RUN_LOOP_H_
 
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/macros.h"
@@ skipping 42 matching lines @@
   // earlier call to Run() when there aren't any tasks or messages in the queue.
   //
   // There can be other nested RunLoops servicing the same task queue
   // (MessageLoop); Quitting one RunLoop has no bearing on the others. Quit()
   // and QuitWhenIdle() can be called before, during or after Run(). If called
   // before Run(), Run() will return immediately when called. Calling Quit() or
   // QuitWhenIdle() after the RunLoop has already finished running has no
   // effect.
   //
   // WARNING: You must NEVER assume that a call to Quit() or QuitWhenIdle() will
-  // terminate the targetted message loop. If a nested message loop continues
+  // terminate the targetted message loop. If a nested run loop continues
   // running, the target may NEVER terminate. It is very easy to livelock (run
   // forever) in such a case.
   void Quit();
   void QuitWhenIdle();
 
   // Convenience methods to get a closure that safely calls Quit() or
   // QuitWhenIdle() (has no effect if the RunLoop instance is gone).
   //
   // Example:
   //   RunLoop run_loop;
@@ skipping 69 matching lines @@
 
   // WeakPtrFactory for QuitClosure safety.
   base::WeakPtrFactory<RunLoop> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RunLoop);
 };
 
 }  // namespace base
 
 #endif  // BASE_RUN_LOOP_H_