Depend on support lib preferences

Bug: 24576551
Change-Id: Ic6190bacd3f7582c9bbc8de972da4612bd92421e

src/com/android/settings/widget/ChartGridView.java

@@ -16,8 +16,6 @@
 
 package com.android.settings.widget;
 
-import static com.android.settings.DataUsageSummary.formatDateRange;
-
 import android.content.Context;
 import android.content.res.ColorStateList;
 import android.content.res.Resources;
@@ -34,6 +32,8 @@ import android.view.View;
 import com.android.internal.util.Preconditions;
 import com.android.settings.R;
 
+import static com.android.settings.DataUsageSummary.formatDateRange;
+
 /**
  * Background of {@link ChartView} that renders grid lines as requested by
  * {@link ChartAxis#getTickPoints()}.