Allow MediaSession in iframes to be routed

content/browser/media/session/audio_focus_manager_unittest.cc

Index: content/browser/media/session/audio_focus_manager_unittest.cc
diff --git a/content/browser/media/session/audio_focus_manager_unittest.cc b/content/browser/media/session/audio_focus_manager_unittest.cc
index 37c577cf7a42d781bde00ff1dcee0a1a2ce3d11c..994e38072ac3277e1ba1c7c761d77a314e53a39c 100644
--- a/content/browser/media/session/audio_focus_manager_unittest.cc
+++ b/content/browser/media/session/audio_focus_manager_unittest.cc
@@ -24,6 +24,7 @@ class MockMediaSessionPlayerObserver : public MediaSessionPlayerObserver {
   void OnResume(int player_id) override {}
   void OnSetVolumeMultiplier(
       int player_id, double volume_multiplier) override {}
+  RenderFrameHost* GetRenderFrameHost() const override { return nullptr; }
 };
 
 }  // anonymous namespace