Implement a module system for the extension bindings JS.

chrome/renderer/extensions/miscellaneous_bindings.h

Index: chrome/renderer/extensions/miscellaneous_bindings.h
diff --git a/chrome/renderer/extensions/miscellaneous_bindings.h b/chrome/renderer/extensions/miscellaneous_bindings.h
index 1db641b876e45ba5dc7a2f0fc2d2726fc374494a..e4ca12e66d05031247836f443ea82c085b2e681d 100644
--- a/chrome/renderer/extensions/miscellaneous_bindings.h
+++ b/chrome/renderer/extensions/miscellaneous_bindings.h
@@ -10,6 +10,7 @@
 
 #include "chrome/renderer/extensions/chrome_v8_context_set.h"
 
+class ChromeV8Extension;
 class ExtensionDispatcher;
 
 namespace content {
@@ -30,7 +31,7 @@ namespace extensions {
 class MiscellaneousBindings {
  public:
   // Creates an instance of the extension.
-  static v8::Extension* Get(ExtensionDispatcher* dispatcher);
+  static ChromeV8Extension* Get(ExtensionDispatcher* dispatcher);
 
   // Delivers a message sent using content script messaging to some of the
   // contexts in |bindings_context_set|. If |restrict_to_render_view| is