Bug 1277571 - Bind the scroll function to this in breadcrumbs to pass it to event handlers; r=jdescottes

MozReview-Commit-ID: bi6ix3k3Ey

--HG--
extra : rebase_source : 1252ab8e944f0cc17052e3ff4f5ed2cb29fa614e

devtools/client/inspector/breadcrumbs.js

@@ -332,6 +332,7 @@ HTMLBreadcrumbs.prototype = {
         this.outer);
 
     this.container = this.arrowScrollBox.inner;
+    this.scroll = this.scroll.bind(this);
     this.arrowScrollBox.on("overflow", this.scroll);
 
     // These separators are used for CSS purposes only, and are positioned