Removing the disabled undo button.

 Bug: 7333546

Addendum to http://go/ag//#/c/238167/

Change-Id: If39d93ffa9367ecd6b731c2c32ed0cab055000f4
diff --git a/res/drawable/btn_undo.xml b/res/drawable/btn_undo.xml
deleted file mode 100644
index 3323255..0000000
--- a/res/drawable/btn_undo.xml
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2012 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:state_enabled="false" android:drawable="@drawable/filtershow_button_undo_disabled" />
-    <item android:drawable="@drawable/filtershow_button_undo" />
-</selector>
-
diff --git a/res/drawable/filtershow_button_undo_disabled.png b/res/drawable/filtershow_button_undo_disabled.png
deleted file mode 100644
index 6d42aa8..0000000
--- a/res/drawable/filtershow_button_undo_disabled.png
+++ /dev/null
Binary files differ