Fix Chromium clang plugin warnings

webrtc/modules/audio_coding/test/PCMFile.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_TEST_PCMFILE_H_
 #define WEBRTC_MODULES_AUDIO_CODING_TEST_PCMFILE_H_
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <string>
 
 #include "webrtc/base/optional.h"
 #include "webrtc/modules/include/module_common_types.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class PCMFile {
  public:
   PCMFile();
   PCMFile(uint32_t timestamp);
-  ~PCMFile() {
-    if (pcm_file_ != NULL) {
-      fclose(pcm_file_);
-    }
-  }
+  ~PCMFile();
 
   void Open(const std::string& filename, uint16_t frequency, const char* mode,
             bool auto_rewind = false);
 
   int32_t Read10MsData(AudioFrame& audio_frame);
 
   void Write10MsData(int16_t *playout_buffer, size_t length_smpls);
   void Write10MsData(AudioFrame& audio_frame);
 
   uint16_t PayloadLength10Ms() const;
@@ skipping 27 matching lines @@
   uint32_t timestamp_;
   bool read_stereo_;
   bool save_stereo_;
   rtc::Optional<int> num_10ms_blocks_to_read_;
   int blocks_read_ = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_TEST_PCMFILE_H_