[CrOS] Enumerate existing mount points and check for media devices.

chrome/browser/media_gallery/media_device_notifications_chromeos.h

Index: chrome/browser/media_gallery/media_device_notifications_chromeos.h
diff --git a/chrome/browser/media_gallery/media_device_notifications_chromeos.h b/chrome/browser/media_gallery/media_device_notifications_chromeos.h
index 8b73abc6f330137a921135bc920b18ba1ffd1904..7f9b625ece1f7850152cf69a931e48387b905745 100644
--- a/chrome/browser/media_gallery/media_device_notifications_chromeos.h
+++ b/chrome/browser/media_gallery/media_device_notifications_chromeos.h
@@ -47,6 +47,10 @@ class MediaDeviceNotifications
   // Private to avoid code deleting the object.
   virtual ~MediaDeviceNotifications();
 
+  // Checks existing mount points map for media devices. For each mount point,
+  // call CheckMountedPathOnFileThread() below.
+  void CheckExistingMountPointsOnUIThread();
+
   // Checks if the mount point in |mount_info| is a media device. If it is,
   // then continue with AddMountedPathOnUIThread() below.
   void CheckMountedPathOnFileThread(