<webview>: Cleanup WebRequest event listeners when embedder destroyed

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