DevTools: Turn *Model events into symbols

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

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @extends {WebInspector.CodeMirrorTextEditor}
  * @param {!WebInspector.SourcesTextEditorDelegate} delegate
  */
 WebInspector.SourcesTextEditor = function(delegate)
@@ skipping 575 matching lines @@
         style.textContent = rules;
         doc.head.appendChild(style);
     },
 
     __proto__: WebInspector.CodeMirrorTextEditor.prototype
 }
 
 /** @typedef {{lineNumber: number, event: !Event}} */
 WebInspector.SourcesTextEditor.GutterClickEventData;
 
-/** @enum {string} */
+/** @enum {symbol} */
 WebInspector.SourcesTextEditor.Events = {
-    GutterClick: "GutterClick"
+    GutterClick: Symbol("GutterClick")
 }
+
 /**
  * @interface
  */
 WebInspector.SourcesTextEditorDelegate = function() { }
 WebInspector.SourcesTextEditorDelegate.prototype = {
 
     /**
      * @param {!WebInspector.TextRange} oldRange
      * @param {!WebInspector.TextRange} newRange
      */
@@ skipping 361 matching lines @@
         this._codeMirror.addOverlay(overlayMode);
         this._highlightDescriptor = {
             overlay: overlayMode,
             selectionStart: selectionStart
         };
     }
 }
 
 WebInspector.SourcesTextEditor.LinesToScanForIndentationGuessing = 1000;
 WebInspector.SourcesTextEditor.MaximumNumberOfWhitespacesPerSingleSpan = 16;