DevTools: Improve CommandLineAPI's getEventListeners result.

Source/core/inspector/InjectedScriptSource.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1359 matching lines @@
         InjectedScriptHost.inspect(remoteObject, hints);
     },
 
     clear: function()
     {
         InjectedScriptHost.clearConsoleMessages();
     },
 
     /**
      * @param {Node} node
+     * @return {{type: string, listener: function(), useCapture: boolean, remove: function()}|undefined}
      */
     getEventListeners: function(node)
     {
-        return InjectedScriptHost.getEventListeners(node);
+        var result = InjectedScriptHost.getEventListeners(node);
+        if (!result)
+            return result;
+        /** @this {{type: string, listener: function(), useCapture: boolean}} */
+        var removeFunc = function()
+        {
+            node.removeEventListener(this.type, this.listener, this.useCapture);
+        }
+        for (var type in result) {
+            var listeners = result[type];
+            for (var i = 0, listener; listener = listeners[i]; ++i) {
+                listener["type"] = type;
+                listener["remove"] = removeFunc;
+            }
+        }
+        return result;
     },
 
     debug: function(fn)
     {
         InjectedScriptHost.debugFunction(fn);
     },
 
     undebug: function(fn)
     {
         InjectedScriptHost.undebugFunction(fn);
@@ skipping 53 matching lines @@
      */
     _logEvent: function(event)
     {
         inspectedWindow.console.log(event.type, event);
     }
 }
 
 injectedScript._commandLineAPIImpl = new CommandLineAPIImpl();
 return injectedScript;
 })