Bug 1059308 - cleanup highlighter.js. r=pbrosset

toolkit/devtools/server/actors/highlighter.js

@@ -610,7 +610,6 @@ function AutoRefreshHighlighter(tabActor) {
   EventEmitter.decorate(this);
 
   this.tabActor = tabActor;
-  this.browser = tabActor.browser;
   this.win = tabActor.window;
 
   this.currentNode = null;
@@ -759,7 +758,6 @@ AutoRefreshHighlighter.prototype = {
 
     this.tabActor = null;
     this.win = null;
-    this.browser = null;
     this.currentNode = null;
     this.layoutHelpers = null;
   }