Bug 1357121 - Allow dashes and underscore in OTA distribution name. r=nalexander

MozReview-Commit-ID: 9PchGiKPGLi

--HG--
extra : rebase_source : 42360222fb3abc359d46180dc385c89a4c706cfb

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

@@ -878,7 +878,7 @@ public class Distribution {
 
         // We restrict here to avoid injection attacks. After all,
         // we're downloading a distribution payload based on intent input.
-        if (!content.matches("^[a-zA-Z0-9]+$")) {
+        if (!content.matches("^[a-zA-Z0-9_-]+$")) {
             Log.e(LOGTAG, "Invalid referrer content: " + content);
             Telemetry.addToHistogram(HISTOGRAM_REFERRER_INVALID, 1);
             return null;