No bug - Fix Eslint warnings which showed up after merge. r=eslint-fix a=eslint-fix

MozReview-Commit-ID: 17TDsBMCsUx

--HG--
extra : amend_source : d16c96ea99ecbf9e3cbe341f4bb80c65659843cc

devtools/client/sourceeditor/editor.js

@@ -1293,7 +1293,6 @@ Editor.prototype = {
     if (!this._isInputOrTextarea(event.target)) {
       return;
     }
-    let cm = editors.get(this);
     let node = event.originalTarget;
 
     switch (name) {

toolkit/mozapps/extensions/test/xpcshell/test_webextension.js

@@ -401,4 +401,4 @@ add_task(function* developerEmpty() {
     equal(addon.homepageURL, "https://example.net");
     addon.uninstall();
   }
-});
+});