Avoids crash in WebRTC audio clients for 96kHz render rate on Mac OSX.

TBR=xians
BUG=166523
TEST=Misc set of WebRTC audio clients on Mac.

Review URL: https://codereview.chromium.org/11773017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175323 0039d316-1c4b-4281-b951-d872f2087c98
WebRtcAudioRenderer::~WebRtcAudioRenderer() {
  DCHECK_EQ(state_, UNINITIALIZED);
  buffer_.reset();
}

WebRtcAudioRenderer::~WebRtcAudioRenderer() {
  DCHECK_EQ(state_, UNINITIALIZED);
  buffer_.reset();
}
