Bug 1291277 - Don't show pending crash reports notification on Release or Beta channnels. r=jaws

We were displaying this notificaton on all channels except Release before,
but UX wants us to suppress this on Beta for now until we have a better
sense of our population on that channel.

MozReview-Commit-ID: D55cbtctcR

browser/components/nsBrowserGlue.js

@@ -1135,7 +1135,7 @@ BrowserGlue.prototype = {
 
     this._checkForOldBuildUpdates();
 
-    if ("release" != AppConstants.MOZ_UPDATE_CHANNEL) {
+    if (!AppConstants.RELEASE_BUILD) {
       this.checkForPendingCrashReports();
     }