Implement a module system for the extension bindings JS.

chrome/renderer/extensions/event_bindings.h

Index: chrome/renderer/extensions/event_bindings.h
diff --git a/chrome/renderer/extensions/event_bindings.h b/chrome/renderer/extensions/event_bindings.h
index 64ada2292f0fdc6daf411dcf13b67a40151bb332..6181b2568ce09556e4b4c6f7a79de0045cf6fd21 100644
--- a/chrome/renderer/extensions/event_bindings.h
+++ b/chrome/renderer/extensions/event_bindings.h
@@ -6,16 +6,13 @@
 #define CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_
 #pragma once
 
+class ChromeV8Extension;
 class ExtensionDispatcher;
 
-namespace v8 {
-class Extension;
-}
-
 // This class deals with the javascript bindings related to Event objects.
 class EventBindings {
  public:
-  static v8::Extension* Get(ExtensionDispatcher* dispatcher);
+  static ChromeV8Extension* Get(ExtensionDispatcher* dispatcher);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_EVENT_BINDINGS_H_