Clean out unused methods from VoiceEngine and VoEBase.

voice_engine/statistics.cc

 /*
  *  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.
  */
 
@@ skipping 63 matching lines @@
     sprintf(traceMessage, "%s (error=%d)", msg, error);
 
     WEBRTC_TRACE(level, kTraceVoice, VoEId(_instanceId,-1), "%s",
                  traceMessage);
 
     rtc::CritScope cs(&lock_);
     _lastError = error;
     return 0;
 }
 
-int32_t Statistics::LastError() const
-{
-    int32_t ret;
-    {
-        rtc::CritScope cs(&lock_);
-        ret = _lastError;
-    }
-    WEBRTC_TRACE(kTraceStateInfo, kTraceVoice, VoEId(_instanceId, -1),
-                 "LastError() => %d", ret);
-    return ret;
-}
-
 }  // namespace voe
 
 }  // namespace webrtc