Use MakeWeak() to clean up function pointers in NativeHandler.

chrome/renderer/extensions/native_handler.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_
 #define CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_
 
 #include "base/bind.h"
-#include "base/memory/linked_ptr.h"
 #include "v8/include/v8.h"
 
 #include <string>
-#include <vector>
 
 namespace extensions {
 
 // A NativeHandler is a factory for JS objects with functions on them that map
 // to native C++ functions. Subclasses should call RouteFunction() in their
 // constructor to define functions on the created JS objects.
 //
 // NativeHandlers are intended to be used with a ModuleSystem. The ModuleSystem
 // will assume ownership of the NativeHandler, and as a ModuleSystem is tied to
 // a single v8::Context, this implies that NativeHandlers will also be tied to
@@ skipping 17 matching lines @@
   // NewInstance()s of this NativeHandler will have a property |name| which
   // will be handled by |handler_function|.
   void RouteFunction(const std::string& name,
                      const HandlerFunction& handler_function);
 
   void RouteStaticFunction(const std::string& name,
                            const HandlerFunc handler_func);
 
  private:
   static v8::Handle<v8::Value> Router(const v8::Arguments& args);
+  static void DisposeFunction(v8::Persistent<v8::Value> object,
+                              void* parameter);
 
-  std::vector<linked_ptr<HandlerFunction> > handler_functions_;
   v8::Persistent<v8::ObjectTemplate> object_template_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeHandler);
 };
 
 }  // extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_NATIVE_HANDLER_H_