Eliminate duplicated code in Settings for category headers

Change-Id: I5bdba2ad4f9e1987f9e818af9d5aa96a9d558f6b

src/com/android/settings/DataUsageSummary.java

@@ -1811,8 +1811,8 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
             final AppItem item = mItems.get(position);
             if (getItemViewType(position) == 1) {
                 if (convertView == null) {
-                    convertView = inflateCategoryHeader(LayoutInflater.from(parent.getContext()),
-                            parent);
+                    convertView = Utils.inflateCategoryHeader(LayoutInflater.from(
+                            parent.getContext()), parent);
                 }
 
                 final TextView title = (TextView) convertView.findViewById(android.R.id.title);
@@ -2503,14 +2503,6 @@ public class DataUsageSummary extends HighlightingFragment implements Indexable
         return view;
     }
 
-    private static View inflateCategoryHeader(LayoutInflater inflater, ViewGroup root) {
-        final TypedArray a = inflater.getContext().obtainStyledAttributes(null,
-                com.android.internal.R.styleable.Preference,
-                com.android.internal.R.attr.preferenceCategoryStyle, 0);
-        final int resId = a.getResourceId(com.android.internal.R.styleable.Preference_layout, 0);
-        return inflater.inflate(resId, root, false);
-    }
-
     /**
      * Test if any networks are currently limited.
      */