Revert 184837

chrome/renderer/extensions/object_backed_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_OBJECT_BACKED_NATIVE_HANDLER_H_
-#define CHROME_RENDERER_EXTENSIONS_OBJECT_BACKED_NATIVE_HANDLER_H_
-
-#include <string>
-#include <vector>
-
-#include "base/bind.h"
-#include "base/memory/linked_ptr.h"
-#include "chrome/renderer/extensions/native_handler.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-
-// An ObjectBackedNativeHandler 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.
-class ObjectBackedNativeHandler : public NativeHandler {
- public:
-  explicit ObjectBackedNativeHandler(v8::Handle<v8::Context> context);
-  virtual ~ObjectBackedNativeHandler();
-
-  // Create an object with bindings to the native functions defined through
-  // RouteFunction().
-  virtual v8::Handle<v8::Object> NewInstance() OVERRIDE;
-
- protected:
-  typedef v8::Handle<v8::Value> (*HandlerFunc)(const v8::Arguments&);
-  typedef base::Callback<v8::Handle<v8::Value>(const v8::Arguments&)>
-      HandlerFunction;
-
-  // Installs a new 'route' from |name| to |handler_function|. This means that
-  // NewInstance()s of this ObjectBackedNativeHandler 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);
-
-  // Invalidate this object so it cannot be used any more. This is needed
-  // because it's possible for this to outlive |v8_context_|. Invalidate must
-  // be called before this happens.
-  //
-  // Subclasses may override to invalidate their own V8 state, but always
-  // call superclass eventually.
-  //
-  // This must be idempotent. Returns true if it was the first time this was
-  // called, false otherwise.
-  virtual bool Invalidate();
-
-  v8::Handle<v8::Context> v8_context() { return v8_context_; }
-
- private:
-  static v8::Handle<v8::Value> Router(const v8::Arguments& args);
-
-  std::vector<linked_ptr<HandlerFunction> > handler_functions_;
-  v8::Handle<v8::Context> v8_context_;
-  v8::Persistent<v8::ObjectTemplate> object_template_;
-  bool is_valid_;
-
-  DISALLOW_COPY_AND_ASSIGN(ObjectBackedNativeHandler);
-};
-
-}  // extensions
-
-#endif  // CHROME_RENDERER_EXTENSIONS_OBJECT_BACKED_NATIVE_HANDLER_H_