Media: replace HasActiveEffectivelyFullscreenVideo DCHECK with early return.

content/browser/media/media_web_contents_observer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/media/media_web_contents_observer.h"
 
 #include <memory>
 
 #include "build/build_config.h"
 #include "content/browser/media/audible_metrics.h"
@@ skipping 44 matching lines @@
       CreateAudioPowerSaveBlocker();
   } else {
     audio_power_save_blocker_.reset();
   }
 
   GetAudibleMetrics()->UpdateAudibleWebContentsState(
       web_contents(), audio_stream_monitor->IsCurrentlyAudible());
 }
 
 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.
   const auto& players = active_video_players_.find(fullscreen_player_->first);
   if (players == active_video_players_.end())
     return false;
   if (players->second.find(fullscreen_player_->second) == players->second.end())
     return false;
 
   return true;
@@ skipping 209 matching lines @@
   if (it == player_map->end())
     return;
 
   for (int delegate_id : it->second)
     removed_players->insert(MediaPlayerId(render_frame_host, delegate_id));
 
   player_map->erase(it);
 }
 
 }  // namespace content