[PPAPI] Fix a bunch of spelling mistakes

ppapi/api/pp_errors.idl

 /* 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.
  */
 
 /**
  * This file defines an enumeration of all PPAPI error codes.
  */
 
 /**
@@ skipping 71 matching lines @@
   /**
    * Returned if you try to use a null completion callback to "block until
    * complete" on the main thread. Blocking the main thread is not permitted
    * to keep the browser responsive (otherwise, you may not be able to handle
    * input events, and there are reentrancy and deadlock issues).
    *
    * The goal is to provide blocking calls from background threads, but PPAPI
    * calls on background threads are not currently supported. Until this
    * support is complete, you must either do asynchronous operations on the
    * main thread, or provide an adaptor for a blocking background thread to
-   * execute the operaitions on the main thread.
+   * execute the operations on the main thread.
    */
   PP_ERROR_BLOCKS_MAIN_THREAD = -13,
 
   PP_ERROR_FILENOTFOUND   = -20,
   /** This value indicates failure due to a file that already exists. */
   PP_ERROR_FILEEXISTS     = -21,
   /** This value indicates failure due to a file that is too big. */
   PP_ERROR_FILETOOBIG     = -22,
   /**
    * This value indicates failure due to a file having been modified
@@ skipping 27 matching lines @@
    * Without this registration step, no PPAPI calls are supported.
    */
   PP_ERROR_NO_MESSAGE_LOOP = -51,
   /**
    * Indicates that the requested operation is not permitted on the current
    * thread.
    */
   PP_ERROR_WRONG_THREAD   = -52
 };