Bug 1401293 - Remove unneeded special handling for the devtools panel from extension-process-script.js. r=kmag

MozReview-Commit-ID: 3pjuoqjULAB

toolkit/components/extensions/extension-process-script.js

@@ -224,7 +224,6 @@ DocumentManager = {
    */
   checkParentFrames(window, addonId) {
     while (window.parent !== window) {
-      let {frameElement} = window;
       window = window.parent;
 
       let principal = window.document.nodePrincipal;
@@ -235,14 +234,6 @@ DocumentManager = {
         if (window.location.href === "about:addons") {
           return true;
         }
-
-        // NOTE: Special handling for devtools panels using a chrome iframe here
-        // for the devtools panel, it is needed because a content iframe breaks
-        // switching between docked and undocked mode (see bug 1075490).
-        if (frameElement &&
-            frameElement.mozMatchesSelector("browser[webextension-view-type='devtools_panel']")) {
-          return true;
-        }
       }
 
       if (principal.addonId !== addonId) {