Print Preview Cleanup: Creating enum with all custom events used.

chrome/browser/resources/print_preview/margins_ui_pair.js

 // Copyright (c) 2011 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.
 
 cr.define('print_preview', function() {
   'strict';
 
   /**
    * @constructor
    * This class represents a margin line and a textbox corresponding to that
@@ skipping 158 matching lines @@
      */
     onMouseDown_: function(e) {
       if (e.button != 0)
         return;
       if (e.target != this)
         return;
       var point = print_preview.MarginsUI.convert({x: e.x, y: e.y});
       this.originBeforeDragging = { x: this.offsetLeft, y: this.offsetTop };
       this.mousePointerOffset =
           { x: point.x - this.offsetLeft, y: point.y - this.offsetTop };
-      cr.dispatchSimpleEvent(this, 'MarginsLineMouseDown');
+      cr.dispatchSimpleEvent(this, customEvents.MARGINS_LINE_MOUSE_DOWN);
     },
 
     /**
      * Executes whenever a mouseup event occurs while |this| is dragged.
      */
     onMouseUp: function() {
       this.box_.onTextValueMayHaveChanged();
     },
 
     /**
@@ skipping 97 matching lines @@
 
       this.rectangle = this.getCoordinates_(newMarginsRectangle);
       this.drawDraggableArea_();
     },
   };
 
   return {
     MarginsUIPair: MarginsUIPair
   };
 });