[MediaSession] Don't reset metadata and actions when the session goes uncontrollable

content/browser/media/session/media_session_impl.cc

 // Copyright 2015 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/session/media_session_impl.h"
 
 #include <algorithm>
 #include "content/browser/media/session/audio_focus_delegate.h"
 #include "content/browser/media/session/media_session_controller.h"
 #include "content/browser/media/session/media_session_player_observer.h"
@@ skipping 612 matching lines @@
 
 void MediaSessionImpl::UpdateRoutedService() {
   MediaSessionServiceImpl* new_service = ComputeServiceForRouting();
   if (new_service == routed_service_)
     return;
 
   routed_service_ = new_service;
   if (routed_service_) {
     NotifyMediaSessionMetadataChange(routed_service_->metadata());
     NotifyMediaSessionActionsChange(routed_service_->actions());
-  } else {
-    NotifyMediaSessionMetadataChange(base::nullopt);
-    NotifyMediaSessionActionsChange(
-        std::set<blink::mojom::MediaSessionAction>());
   }
 }
 
 MediaSessionServiceImpl* MediaSessionImpl::ComputeServiceForRouting() {
   // The service selection strategy is: select a frame that has a playing/paused
   // player and has a corresponding MediaSessionService and return the
   // corresponding MediaSessionService. If multiple frames satisfy the criteria,
   // prefer the top-most frame.
   std::set<RenderFrameHost*> frames;
   for (const auto& player : normal_players_) {
@@ skipping 25 matching lines @@
     if (!IsServiceActiveForRenderFrameHost(frame))
       continue;
     best_frame = frame;
     min_depth = depth;
   }
 
   return best_frame ? services_[best_frame] : nullptr;
 }
 
 }  // namespace content