[MediaSession] A fix for MediaSessionService routing

content/browser/media/session/media_session_impl_browsertest.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 <stddef.h>
 
 #include <list>
 #include <vector>
@@ skipping 139 matching lines @@
                                           : MediaSessionImpl::State::INACTIVE);
   }
 
   void SystemStartDucking() { media_session_->StartDucking(); }
 
   void SystemStopDucking() { media_session_->StopDucking(); }
 
   void EnsureMediaSessionService() {
     mock_media_session_service_.reset(new MockMediaSessionServiceImpl(
         shell()->web_contents()->GetMainFrame()));
-    mock_media_session_service_->SetMetadata(content::MediaMetadata());
   }
 
   void SetPlaybackState(blink::mojom::MediaSessionPlaybackState state) {
     mock_media_session_service_->SetPlaybackState(state);
   }
 
   MockMediaSessionObserver* mock_media_session_observer() {
     return mock_media_session_observer_.get();
   }
 
@@ skipping 1245 matching lines @@
   StartNewPlayer(player_observer.get(), media::MediaContentType::Persistent);
   clock->Advance(base::TimeDelta::FromMilliseconds(1000));
   media_session_->Stop(MediaSession::SuspendType::UI);
 
   std::unique_ptr<base::HistogramSamples> samples(
       tester.GetHistogramSamplesSinceCreation("Media.Session.ActiveTime"));
   EXPECT_EQ(2, samples->TotalCount());
   EXPECT_EQ(1, samples->GetCount(1000));
   EXPECT_EQ(1, samples->GetCount(10000));
 }