[DevTools] Remove Common.Event.target field.

third_party/WebKit/Source/devtools/front_end/snippets/ScriptSnippetModel.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 101 matching lines @@
     var breakpointLocations = this._removeBreakpoints(uiSourceCode);
     this._restoreBreakpoints(uiSourceCode, breakpointLocations);
     this._uiSourceCodeForSnippetId[snippet.id] = uiSourceCode;
     return uiSourceCode;
   }
 
   /**
    * @param {!Common.Event} event
    */
   _workingCopyChanged(event) {
-    var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.target);
+    var uiSourceCode = /** @type {!Workspace.UISourceCode} */ (event.data);
     this._scriptSnippetEdited(uiSourceCode);
   }
 
   /**
    * @param {string} url
    */
   deleteScriptSnippet(url) {
     var uiSourceCode = this._project.uiSourceCodeForURL(url);
     if (!uiSourceCode)
       return;
@@ skipping 486 matching lines @@
    */
   deleteFile(url) {
     this._model.deleteScriptSnippet(url);
   }
 };
 
 /**
  * @type {!Snippets.ScriptSnippetModel}
  */
 Snippets.scriptSnippetModel = new Snippets.ScriptSnippetModel(Workspace.workspace);