DevTools: Always construct CodeMirror explicitly, via "new"

Source/devtools/front_end/source_frame/CodeMirrorTextEditor.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
  */
 WebInspector.CodeMirrorTextEditor = function(url, delegate)
 {
     WebInspector.VBox.call(this);
     this._delegate = delegate;
     this._url = url;
 
     this.registerRequiredCSS("cm/codemirror.css");
     this.registerRequiredCSS("cm/cmdevtools.css");
 
-    this._codeMirror = window.CodeMirror(this.element, {
+    this._codeMirror = new window.CodeMirror(this.element, {
         lineNumbers: true,
         gutters: ["CodeMirror-linenumbers"],
         matchBrackets: true,
         smartIndent: false,
         styleSelectedText: true,
         electricChars: false,
     });
     this._codeMirror._codeMirrorTextEditor = this;
 
     CodeMirror.keyMap["devtools-common"] = {
@@ skipping 2069 matching lines @@
     var backgroundColorRule = backgroundColor ? ".CodeMirror .CodeMirror-selected { background-color: " + backgroundColor + ";}" : "";
     var foregroundColor = InspectorFrontendHost.getSelectionForegroundColor();
     var foregroundColorRule = foregroundColor ? ".CodeMirror .CodeMirror-selectedtext:not(.CodeMirror-persist-highlight) { color: " + foregroundColor + "!important;}" : "";
     if (!foregroundColorRule && !backgroundColorRule)
         return;
 
     var style = document.createElement("style");
     style.textContent = backgroundColorRule + foregroundColorRule;
     document.head.appendChild(style);
 })();