Remove usages of ActionBarActivity.
am: f4bb971c2d

Change-Id: Ia6589b0c1ca6cc99ecac7fa88e2782f7fbedac78
diff --git a/res/xml/preference_headers.xml b/res/xml/preference_headers.xml
index b31c433..998c357 100644
--- a/res/xml/preference_headers.xml
+++ b/res/xml/preference_headers.xml
@@ -17,7 +17,6 @@
 -->
 
 <preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
-    xmlns:android="http://schemas.android.com/apk/res/android">
 
     <header android:fragment="com.android.mail.ui.settings.GeneralPrefsFragment"
             android:title="@string/general_preferences_title" />