Remove dead code.

Bug: 11257292
Change-Id: Ifb88f3fe03a8a3bc3cdf372d902f4b63c1ed454b
diff --git a/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java b/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java
index f30e7bb..c3d34ec 100644
--- a/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java
+++ b/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java
@@ -506,11 +506,6 @@
         }
     }
 
-    static interface AttachCallback {
-        void onAttachedToWindow();
-        void onDetachedFromWindow();
-    }
-
     private final class MediaRouterCallback extends MediaRouter.Callback {
         @Override
         public void onRouteAdded(MediaRouter router, MediaRouter.RouteInfo info) {
diff --git a/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java b/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
index ec31253..3fe9c78 100644
--- a/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
+++ b/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
@@ -251,8 +251,8 @@
         if (icon != mCurrentIconDrawable) {
             mCurrentIconDrawable = icon;
 
-            // There seems to be a bug in the framework where feature drawables
-            // will not start animating unless they experience a transition from
+            // Prior to KLP MR1 there was a bug in ImageView that caused feature drawables
+            // to not start animating unless they experienced a transition from
             // invisible to visible.  So we force the drawable to be invisible here.
             // The window will make the drawable visible when attached.
             icon.setVisible(false, true);