Replace private divider with framework divider

The framework defines ?android:attr/dividerHorizontal. Instead of defining our
own divider by specifying some arbitrary RGB colour, utilize the framework's
divider.

bug 3335145

Change-Id: I64dd30a5a73b0884f82f6a2b9fbbd88c6782e0db
diff --git a/res/drawable/divider.xml b/res/drawable/divider.xml
deleted file mode 100644
index c6789e8..0000000
--- a/res/drawable/divider.xml
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2010 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.
--->
-
-<!-- Drawable for a divider.  Intended to be used with LinearLayouts. -->
-
-<shape
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:shape="rectangle" >
-    <size
-        android:width="1dip"
-        android:height="1dip"
-        />
-    <solid
-        android:color="@color/divider_color"
-        />
-</shape>
\ No newline at end of file