MediaRouter: Remove unused members and method in MediaRouteControllerDialog

Change-Id: I769570abccc5c9c011512589cbaf501bb40428b8
diff --git a/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java b/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
index 6f69388..9fa76a8 100644
--- a/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
+++ b/v7/mediarouter/src/android/support/v7/app/MediaRouteControllerDialog.java
@@ -84,8 +84,6 @@
 
     private boolean mCreated;
     private boolean mAttachedToWindow;
-    private Drawable mMediaRouteConnectingDrawable;
-    private Drawable mMediaRouteOnDrawable;
 
     private View mControlView;
 
@@ -447,22 +445,6 @@
         return true;
     }
 
-    private Drawable getIconDrawable() {
-        if (mRoute.isConnecting()) {
-            if (mMediaRouteConnectingDrawable == null) {
-                mMediaRouteConnectingDrawable = MediaRouterThemeHelper.getThemeDrawable(
-                        getContext(), R.attr.mediaRouteConnectingDrawable);
-            }
-            return mMediaRouteConnectingDrawable;
-        } else {
-            if (mMediaRouteOnDrawable == null) {
-                mMediaRouteOnDrawable = MediaRouterThemeHelper.getThemeDrawable(
-                        getContext(), R.attr.mediaRouteOnDrawable);
-            }
-            return mMediaRouteOnDrawable;
-        }
-    }
-
     private void updateVolume() {
         if (!mVolumeSliderTouched) {
             if (isVolumeControlAvailable()) {