Add metrics regarding concurrent audible tabs in Chromium.

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 ccadfb2dd064e1bbb6b946cd04e94266c938a7cf..233c1e09382b4b22fc94781650d4d79be0dff518 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1185,8 +1185,7 @@ void WebContentsImpl::NotifyNavigationStateChanged(
           "466285 WebContentsImpl::NotifyNavigationStateChanged"));
   // Notify the media observer of potential audibility changes.
   if (changed_flags & INVALIDATE_TYPE_TAB) {
-    media_web_contents_observer_->MaybeUpdateAudibleState(
-        AudioStreamMonitor::monitoring_available() && WasRecentlyAudible());
+    media_web_contents_observer_->MaybeUpdateAudibleState();
   }
 
   if (delegate_)