Mute audio for Spitzer playbacks that haven't received focus yet.

content/browser/media/android/media_session.h

Index: content/browser/media/android/media_session.h
diff --git a/content/browser/media/android/media_session.h b/content/browser/media/android/media_session.h
index b0a1157c52cc3e48dc0dee2fea67ca51349f7b9f..559b8d4a15d9a9ffaf1afbfacf918fd4a346a515 100644
--- a/content/browser/media/android/media_session.h
+++ b/content/browser/media/android/media_session.h
@@ -104,14 +104,6 @@ class CONTENT_EXPORT MediaSession
   friend class content::WebContentsUserData<MediaSession>;
   friend class ::MediaSessionBrowserTest;
 
-  // Resets the |j_media_session_| ref to prevent calling the Java backend
-  // during content_browsertests.
-  void ResetJavaRefForTest();
-  bool IsActiveForTest() const;
-  Type audio_focus_type_for_test() const;
-  void RemoveAllPlayersForTest();
-  MediaSessionUmaHelper* uma_helper_for_test();
-
   enum class State {
     ACTIVE,
     SUSPENDED,
@@ -173,6 +165,10 @@ class CONTENT_EXPORT MediaSession
   base::android::ScopedJavaGlobalRef<jobject> j_media_session_;
   PlayersMap players_;
 
+  // The value returned by RequestSystemAudioFocus() when |j_media_session_| is
+  // unavailable.  Used for testing.
+  bool default_system_audio_focus_response_;
+
   State audio_focus_state_;
   SuspendType suspend_type_;
   Type audio_focus_type_;