Framework: Use holo alert drawables

Replaces the current usage of the GB alert
drawable with theme-consistent holo ones.

Change-Id: I8594ef8276db5bb0e192f3a541937d7281321043
diff --git a/packages/VpnDialogs/src/com/android/vpndialogs/ConfirmDialog.java b/packages/VpnDialogs/src/com/android/vpndialogs/ConfirmDialog.java
index 13d8019..7a1e66c 100644
--- a/packages/VpnDialogs/src/com/android/vpndialogs/ConfirmDialog.java
+++ b/packages/VpnDialogs/src/com/android/vpndialogs/ConfirmDialog.java
@@ -66,7 +66,7 @@
                     getString(R.string.prompt, app.loadLabel(pm)));
             ((CompoundButton) view.findViewById(R.id.check)).setOnCheckedChangeListener(this);
 
-            mAlertParams.mIconId = android.R.drawable.ic_dialog_alert;
+            mAlertParams.mIconAttrId = android.R.attr.alertDialogIcon;
             mAlertParams.mTitle = getText(android.R.string.dialog_alert_title);
             mAlertParams.mPositiveButtonText = getText(android.R.string.ok);
             mAlertParams.mPositiveButtonListener = this;