Add extra WebRTC logging to UserMediaRequest::ContextDestroyed

Bug: 1025218
Change-Id: Iacffae47f361b3e8491657cddcc268f1833da29b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950989
Auto-Submit: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Reviewed-by: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721917}

third_party/blink/renderer/modules/mediastream/user_media_request.cc

@@ -590,6 +590,8 @@ void UserMediaRequest::Fail(WebUserMediaRequest::Error name,
 }
 
 void UserMediaRequest::ContextDestroyed(ExecutionContext*) {
+  if (!is_resolved_)
+    blink::WebRtcLogMessage("UMR::ContextDestroyed. Request not resolved.");
   if (controller_) {
     controller_->CancelUserMediaRequest(this);
     if (!is_resolved_) {