Replacing WebUIBindings use of CPPBoundClass with v8::Extension.

content/renderer/web_ui_extension_data.h

Index: content/renderer/web_ui_extension_data.h
diff --git a/content/renderer/web_ui_extension_data.h b/content/renderer/web_ui_extension_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..23564c26cd8074974049647cd2958a88ab211548
--- /dev/null
+++ b/content/renderer/web_ui_extension_data.h
@@ -0,0 +1,41 @@
+// Copyright 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 CONTENT_RENDERER_WEBUI_EXTENSION_DATA_H_
+#define CONTENT_RENDERER_WEBUI_EXTENSION_DATA_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+#include "content/public/renderer/render_view_observer.h"
+#include "content/public/renderer/render_view_observer_tracker.h"
+
+namespace content {
+
+class WebUIExtensionData
+    : public RenderViewObserver,
+      public RenderViewObserverTracker<WebUIExtensionData> {
+ public:
+  explicit WebUIExtensionData(RenderView* render_view);
+  virtual ~WebUIExtensionData();
+
+  // Returns value for a given |key|. Will return an empty string if no such key
+  // exists in the |variable_map_|.
+  std::string GetValue(const std::string& key) const;
+
+ private:
+  // RenderViewObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnSetWebUIProperty(const std::string& name, const std::string& value);
+
+  std::map<std::string, std::string> variable_map_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebUIExtensionData);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_WEBUI_EXTENSION_DATA_H_