Bug 1054264 - Show pressed state on edit mode's cancel button (r=margaret)

mobile/android/base/resources/layout-large-v11/browser_toolbar.xml

@@ -116,6 +116,7 @@
             style="@style/UrlBar.ImageButton.Icon"
             android:layout_alignParentRight="true"
             android:src="@drawable/close_edit_mode_selector"
+            android:background="@drawable/action_bar_button"
             android:paddingLeft="2dp"
             android:paddingRight="2dp"
             android:contentDescription="@string/edit_mode_cancel"

mobile/android/base/resources/layout/browser_toolbar.xml

@@ -98,6 +98,7 @@
             android:layout_alignParentRight="true"
             android:src="@drawable/close_edit_mode_selector"
             android:contentDescription="@string/edit_mode_cancel"
+            android:background="@drawable/action_bar_button"
             android:visibility="invisible"/>
 
     <!-- The space to the left of the cancel button would be larger than the right because