Use MediaGalleryPreferences directly in GalleryWatchStateTracker interface.

chrome/browser/media_galleries/media_galleries_preferences.cc

Index: chrome/browser/media_galleries/media_galleries_preferences.cc
diff --git a/chrome/browser/media_galleries/media_galleries_preferences.cc b/chrome/browser/media_galleries/media_galleries_preferences.cc
index c549ef3b590453075c553f4db953cfc3b3fa3e17..220c545f95e0de23e800c14a753426fafc76150e 100644
--- a/chrome/browser/media_galleries/media_galleries_preferences.cc
+++ b/chrome/browser/media_galleries/media_galleries_preferences.cc
@@ -656,7 +656,7 @@ void MediaGalleriesPreferences::SetGalleryPermissionForExtension(
 #if defined(ENABLE_EXTENSIONS)
       if (state_tracker) {
         state_tracker->OnGalleryPermissionChanged(extension.id(), pref_id,
-                                                  true);
+                                                  true, this);
       }
 #endif
       return;
@@ -674,7 +674,7 @@ void MediaGalleriesPreferences::SetGalleryPermissionForExtension(
 #if defined(ENABLE_EXTENSIONS)
   if (state_tracker) {
     state_tracker->OnGalleryPermissionChanged(extension.id(), pref_id,
-                                              has_permission);
+                                              has_permission, this);
   }
 #endif
 }