Don't allow backing up contacts storage

Bug 6446450

Change-Id: I2c49d19d4493cd0da62ba554e7c7472270e0e992
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index dcd561c..6f74368 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -26,7 +26,8 @@
 
     <application android:process="android.process.acore"
         android:label="@string/app_label"
-        android:icon="@drawable/app_icon">
+        android:icon="@drawable/app_icon"
+        android:allowBackup="false">
 
         <provider android:name="ContactsProvider2"
             android:authorities="contacts;com.android.contacts"