Unify shorthand for byte-based units.

Change-Id: If990859dee3f0973e1d4c48f05312c84071b3328
diff --git a/core/java/android/net/TrafficStats.java b/core/java/android/net/TrafficStats.java
index dfdea38..973fac1 100644
--- a/core/java/android/net/TrafficStats.java
+++ b/core/java/android/net/TrafficStats.java
@@ -44,6 +44,13 @@
      */
     public final static int UNSUPPORTED = -1;
 
+    /** @hide */
+    public static final long KB_IN_BYTES = 1024;
+    /** @hide */
+    public static final long MB_IN_BYTES = KB_IN_BYTES * 1024;
+    /** @hide */
+    public static final long GB_IN_BYTES = MB_IN_BYTES * 1024;
+
     /**
      * Special UID value used when collecting {@link NetworkStatsHistory} for
      * removed applications.
diff --git a/services/java/com/android/server/net/NetworkStatsService.java b/services/java/com/android/server/net/NetworkStatsService.java
index 414ed1e..c9b67fc 100644
--- a/services/java/com/android/server/net/NetworkStatsService.java
+++ b/services/java/com/android/server/net/NetworkStatsService.java
@@ -34,6 +34,7 @@
 import static android.net.NetworkStats.UID_ALL;
 import static android.net.NetworkTemplate.buildTemplateMobileAll;
 import static android.net.NetworkTemplate.buildTemplateWifi;
+import static android.net.TrafficStats.MB_IN_BYTES;
 import static android.provider.Settings.Secure.NETSTATS_DEV_BUCKET_DURATION;
 import static android.provider.Settings.Secure.NETSTATS_DEV_DELETE_AGE;
 import static android.provider.Settings.Secure.NETSTATS_DEV_PERSIST_BYTES;
@@ -153,10 +154,6 @@
 
     private PendingIntent mPollIntent;
 
-    private static final long KB_IN_BYTES = 1024;
-    private static final long MB_IN_BYTES = 1024 * KB_IN_BYTES;
-    private static final long GB_IN_BYTES = 1024 * MB_IN_BYTES;
-
     private static final String PREFIX_DEV = "dev";
     private static final String PREFIX_UID = "uid";
     private static final String PREFIX_UID_TAG = "uid_tag";