Revert 222090 "<webview>: Cleanup WebRequest event listeners whe..."

trunk/src/chrome/renderer/extensions/webview_custom_bindings.cc

-// Copyright 2013 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.
-
-#include "chrome/renderer/extensions/webview_custom_bindings.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "v8/include/v8.h"
-
-namespace extensions {
-
-WebViewCustomBindings::WebViewCustomBindings(
-    Dispatcher* dispatcher, ChromeV8Context* context)
-    : ChromeV8Extension(dispatcher, context) {
-  RouteFunction("GetNextInstanceID",
-      base::Bind(&WebViewCustomBindings::GetNextInstanceID,
-                 base::Unretained(this)));
-}
-
-void WebViewCustomBindings::GetNextInstanceID(
-    const v8::FunctionCallbackInfo<v8::Value>& args) {
-  static int next_instance_id = 1;
-  args.GetReturnValue().Set(next_instance_id++);
-}
-
-}  // namespace extensions