Bug 1010271 - remove active attribute when toolbox iframe gets destroyed. r=jryans

browser/devtools/webide/content/webide.js

@@ -395,7 +395,6 @@ let UI = {
     if (this.toolboxPromise) {
       this.toolboxPromise.then(toolbox => {
         toolbox.destroy();
-        document.querySelector("#action-button-debug").removeAttribute("active");
         this.toolboxPromise = null;
       }, this.console.error);
     }
@@ -436,6 +435,7 @@ let UI = {
 
     let splitter = document.querySelector(".devtools-horizontal-splitter");
     splitter.setAttribute("hidden", "true");
+    document.querySelector("#action-button-debug").removeAttribute("active");
   },
 
   console: {