DevTools: always use CodeMirror for response preview

third_party/WebKit/Source/devtools/front_end/source_frame/ResourceSourceFrame.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) IBM Corp. 2009  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 41 matching lines @@
      * @return {!Promise}
      */
     populateTextAreaContextMenu: function(contextMenu, lineNumber, columnNumber)
     {
         contextMenu.appendApplicableItems(this._resource);
         return Promise.resolve();
     },
 
     __proto__: WebInspector.SourceFrame.prototype
 }
-
-/**
- * @constructor
- * @extends {WebInspector.VBox}
- * @param {!WebInspector.ContentProvider} resource
- */
-WebInspector.ResourceSourceFrameFallback = function(resource)
-{
-    WebInspector.VBox.call(this);
-    this.registerRequiredCSS("source_frame/resourceSourceFrame.css");
-    this._resource = resource;
-    this._content = this.element.createChild("div", "resource-source-frame-fallback monospace");
-}
-
-WebInspector.ResourceSourceFrameFallback.prototype = {
-    wasShown: function()
-    {
-        if (!this._contentRequested) {
-            this._contentRequested = true;
-            this._resource.requestContent(this._contentLoaded.bind(this));
-        }
-    },
-
-    /**
-     * @param {?string} content
-     */
-    _contentLoaded: function(content)
-    {
-        this._content.textContent = content;
-    },
-
-    __proto__: WebInspector.VBox.prototype
-}