[DevTools] Make SourceFrame.setEditable work.

third_party/WebKit/Source/devtools/front_end/sources/UISourceCodeFrame.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
@@ skipping 254 matching lines @@
    * @protected
    */
   onBindingChanged() {
     // Overriden in subclasses.
   }
 
   _updateStyle() {
     this.element.classList.toggle(
         'source-frame-unsaved-committed-changes',
         Persistence.persistence.hasUnsavedCommittedChanges(this._uiSourceCode));
-    this.setEditable(!this._canEditSource());
+    this.setEditable(this._canEditSource());

[lushnikov, 2016/12/10 00:59:50]

how did it work at all?

   }
 
   onUISourceCodeContentChanged() {
   }
 
   _updateAutocomplete() {
     this.textEditor.configureAutocomplete(
         Common.moduleSetting('textEditorAutocompletion').get() ? this._autocompleteConfig : null);
   }
 
@@ skipping 408 matching lines @@
 
 /**
  * @param {!Workspace.UISourceCode.Message} a
  * @param {!Workspace.UISourceCode.Message} b
  * @return {number}
  */
 Workspace.UISourceCode.Message.messageLevelComparator = function(a, b) {
   return Workspace.UISourceCode.Message._messageLevelPriority[a.level()] -
       Workspace.UISourceCode.Message._messageLevelPriority[b.level()];
 };