RejectedExecutionException in DataUsageLIst

RejectedPolicy throw Exception which will interrupt users

Bug: https://code.google.com/p/android/issues/detail?id=237575
Test: open as many online apps as possible and then open the DataUsageList
Change-Id: I2dabc6ee53cd0f27f59098328fe2a16172f71d0b

src/com/android/settings/datausage/AppDataUsagePreference.java

@@ -90,8 +90,7 @@ public class AppDataUsagePreference extends Preference {
             if (cachedDetail != null) {
                 bindView(cachedDetail, target);
             } else {
-                new UidDetailTask(provider, item, target).executeOnExecutor(
-                        AsyncTask.THREAD_POOL_EXECUTOR);
+                new UidDetailTask(provider, item, target).execute();
             }
         }