Fix two notification update issues on page navigation

content/browser/media/session/media_session_impl.h

Index: content/browser/media/session/media_session_impl.h
diff --git a/content/browser/media/session/media_session_impl.h b/content/browser/media/session/media_session_impl.h
index 1114375d8eae4559ce45faebe36a205608438f94..557f5db8912daa15eab02aeae99c67cb0851efeb 100644
--- a/content/browser/media/session/media_session_impl.h
+++ b/content/browser/media/session/media_session_impl.h
@@ -44,6 +44,7 @@ class MediaSessionImplVisibilityBrowserTest;
 class MediaSessionObserver;
 class MediaSessionPlayerObserver;
 class MediaSessionServiceImpl;
+class MediaSessionServiceImplBrowserTest;
 
 #if defined(OS_ANDROID)
 class MediaSessionAndroid;
@@ -167,6 +168,7 @@ class MediaSessionImpl : public MediaSession,
   // WebContentsObserver implementation
   void WebContentsDestroyed() override;
   void RenderFrameDeleted(RenderFrameHost* rfh) override;
+  void DidFinishNavigation(NavigationHandle* navigation_handle) override;
 
   // MediaSessionService-related methods
 
@@ -199,6 +201,7 @@ class MediaSessionImpl : public MediaSession,
   friend class content::AudioFocusManagerTest;
   friend class content::MediaSessionImplServiceRoutingTest;
   friend class content::MediaSessionImplStateObserver;
+  friend class content::MediaSessionServiceImplBrowserTest;
 
   CONTENT_EXPORT void SetDelegateForTests(
       std::unique_ptr<AudioFocusDelegate> delegate);