Don't back up keychain data

Change-Id: I4fb81afc8d8825ea3ab10f8372c9a836729fc9af
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 15a46a1..4658206 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -3,7 +3,8 @@
           package="com.android.keychain"
           android:sharedUserId="android.uid.system"
           >
-    <application android:label="@string/app_name">
+    <application android:label="@string/app_name"
+            android:allowBackup="false" >
         <service android:name="com.android.keychain.KeyChainService">
             <intent-filter>
                 <action android:name="android.security.IKeyChainService"/>