Browser: Use ICS alert icon

Still using upscaled GB drawable in a few places.

Change-Id: I52471b10809117b5a68e8236dc320fde0da2c533
diff --git a/src/com/android/browser/BookmarkUtils.java b/src/com/android/browser/BookmarkUtils.java
index 4834c39..f0c01f7 100644
--- a/src/com/android/browser/BookmarkUtils.java
+++ b/src/com/android/browser/BookmarkUtils.java
@@ -234,7 +234,7 @@
             final Context context, final Message msg) {
 
         new AlertDialog.Builder(context)
-                .setIcon(android.R.drawable.ic_dialog_alert)
+                .setIconAttribute(android.R.attr.alertDialogIcon)
                 .setMessage(context.getString(R.string.delete_bookmark_warning,
                         title))
                 .setPositiveButton(R.string.ok,