Bug 1373818 - Don't hardcode our tracker per Adjust. r=rnewman

MozReview-Commit-ID: 5O04Qp2IP9U

--HG--
extra : rebase_source : bfb174c8b73a4d37105b8068bcbde2e01d03c55b

mobile/android/base/java/org/mozilla/gecko/distribution/ReferrerReceiver.java

@@ -43,7 +43,7 @@ public class ReferrerReceiver extends BroadcastReceiver {
      * Adjust ID. It's treated as OTA and tracked using Adjust and
      * Mozilla's metrics systems.
      */
-    private static final String MOZILLA_ADJUST_SOURCE = "xodfft";
+    private static final String MOZILLA_ADJUST_SOURCE = "adjust_store";
 
     /**
      * If the install intent has this campaign, we'll load the specified distribution.