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

ppapi/c/private/ppb_testing_private.h

 /* Copyright 2013 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.
  */
 
 /* From private/ppb_testing_private.idl modified Fri May  1 13:14:52 2015. */
 
 #ifndef PPAPI_C_PRIVATE_PPB_TESTING_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PPB_TESTING_PRIVATE_H_
 
@@ skipping 48 matching lines @@
    * The returned image data will represent the current status of the backing
    * store. This will not include any paint, scroll, or replace operations
    * that have not yet been flushed; these operations are only reflected in
    * the backing store (and hence ReadImageData) until after a Flush()
    * operation has completed.
    */
   PP_Bool (*ReadImageData)(PP_Resource device_context_2d,
                            PP_Resource image,
                            const struct PP_Point* top_left);
   /**
-   * Runs a nested message loop. The plugin will be reentered from this call.
+   * Runs a nested run loop. The plugin will be reentered from this call.
    * This function is used for unit testing the API. The normal pattern is to
    * issue some asynchronous call that has a callback. Then you call
    * RunMessageLoop which will suspend the plugin and go back to processing
    * messages, giving the asynchronous operation time to complete. In your
    * callback, you save the data and call QuitMessageLoop, which will then
    * pop back up and continue with the test. This avoids having to write a
    * complicated state machine for simple tests for asynchronous APIs.
    */
   void (*RunMessageLoop)(PP_Instance instance);
   /**
-   * Posts a quit message for the outermost nested message loop. Use this to
+   * Posts a quit message for the outermost nested run loop. Use this to
    * exit and return back to the caller after you call RunMessageLoop.
    */
   void (*QuitMessageLoop)(PP_Instance instance);
   /**
    * Returns the number of live objects (resources + strings + objects)
    * associated with this plugin instance. Used for detecting leaks. Returns
    * (uint32_t)-1 on failure.
    */
   uint32_t (*GetLiveObjectsForInstance)(PP_Instance instance);
   /**
@@ skipping 67 matching lines @@
   void (*RunV8GC)(PP_Instance instance);
 };
 
 typedef struct PPB_Testing_Private_1_0 PPB_Testing_Private;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PRIVATE_PPB_TESTING_PRIVATE_H_ */