Fix incorrect API version information.

ppapi/api/ppb_audio_config.idl

 /* Copyright (c) 2011 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 the PPB_AudioConfig interface for establishing an
  * audio configuration resource within the browser.
  */
 
 label Chrome {
-  M13 = 0.5,
   M14 = 1.0
 };
 
 /**
  * This enumeration contains audio frame count constants.
  * <code>PP_AUDIOMINSAMPLEFRAMECOUNT</code> is the minimum possible frame
  * count. <code>PP_AUDIOMAXSAMPLEFRAMECOUNT</code> is the maximum possible
  * frame count.
  */
 [unnamed] enum PP_AudioFrameSize {
@@ skipping 123 matching lines @@
    * @param[in] config A <code>PP_Resource</code> containing the audio config
    * resource.
    * @return A <code>uint32_t</code> containing sample frame count or
    * 0 if the resource is invalid. See <code>RecommendSampleFrameCount</code>
    * for more on sample frame counts.
    */
   uint32_t GetSampleFrameCount(
       [in] PP_Resource config);
 };