Make tab audible and muted states and cause available for an extension API

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 5ec31a02c05612ac3f3807e8b0e0ed9d560352f4..0f77b40bb78964c1d21e8b0ebe7a8efe9d055f85 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -949,14 +949,14 @@ bool WebContentsImpl::IsAudioMuted() const {
   return audio_muter_.get() && audio_muter_->is_muting();
 }
 
-void WebContentsImpl::SetAudioMuted(bool mute) {
-  DVLOG(1) << "SetAudioMuted(mute=" << mute << "), was " << IsAudioMuted()
-           << " for WebContentsImpl@" << this;
+void WebContentsImpl::SetAudioMuted(bool muted) {
+  DVLOG(1) << "SetAudioMuted(muted=" << muted
+           << "), was " << IsAudioMuted() << " for WebContentsImpl@" << this;
 
-  if (mute == IsAudioMuted())
+  if (muted == IsAudioMuted())
     return;
 
-  if (mute) {
+  if (muted) {
     if (!audio_muter_)
       audio_muter_.reset(new WebContentsAudioMuter(this));
     audio_muter_->StartMuting();