<webview>: Cleanup WebRequest event listeners when embedder destroyed

chrome/renderer/extensions/webview_custom_bindings.h

+// 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.
+
+#ifndef CHROME_RENDERER_EXTENSIONS_WEBVIEW_CUSTOM_BINDINGS_H_
+#define CHROME_RENDERER_EXTENSIONS_WEBVIEW_CUSTOM_BINDINGS_H_
+
+#include "chrome/renderer/extensions/chrome_v8_extension.h"
+
+namespace extensions {
+
+// Implements custom bindings for <webview> operations.
+class WebViewCustomBindings : public ChromeV8Extension {
+ public:
+  WebViewCustomBindings(Dispatcher* dispatcher, ChromeV8Context* context);
+
+ private:
+  // Returns a new embedder-unique instance ID for a <webview>.
+  // This ID is used to uniquely identify a <webview> element.
+  void GetNextInstanceID(const v8::FunctionCallbackInfo<v8::Value>& args);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_RENDERER_EXTENSIONS_WEBVIEW_CUSTOM_BINDINGS_H_