Bug 1079629 - Fix build error when new tablet UI is disabled. r=rnewman

mobile/android/base/resources/drawable/new_tablet_action_bar_button.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
+        android:src="@null"/>

mobile/android/base/resources/drawable/new_tablet_url_bar_nav_button.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
+        android:src="@null"/>