Media: replace HasActiveEffectivelyFullscreenVideo DCHECK with early return.

content/browser/media/media_web_contents_observer.cc

Index: content/browser/media/media_web_contents_observer.cc
diff --git a/content/browser/media/media_web_contents_observer.cc b/content/browser/media/media_web_contents_observer.cc
index d49b495b0eff968bdd7137a52f6626a93a886318..2098facfba14bcc742a7d8407a4fbeceb03a0f31 100644
--- a/content/browser/media/media_web_contents_observer.cc
+++ b/content/browser/media/media_web_contents_observer.cc
@@ -62,9 +62,7 @@ void MediaWebContentsObserver::MaybeUpdateAudibleState() {
 }
 
 bool MediaWebContentsObserver::HasActiveEffectivelyFullscreenVideo() const {
-  DCHECK(web_contents()->IsFullscreen());
-
-  if (!fullscreen_player_)
+  if (!web_contents()->IsFullscreen() || !fullscreen_player_)
     return false;
 
   // Check that the player is active.