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..0af0da2e12190a89b0bc297964ed7eff5b6e529d 100644
--- a/chrome/renderer/extensions/miscellaneous_bindings.h
+++ b/chrome/renderer/extensions/miscellaneous_bindings.h
@@ -10,16 +10,13 @@
 
 #include "chrome/renderer/extensions/chrome_v8_context_set.h"
 
+class ChromeV8Extension;
 class ExtensionDispatcher;
 
 namespace content {
 class RenderView;
 }
 
-namespace v8 {
-class Extension;
-}
-
 namespace extensions {
 
 // Manually implements some random JavaScript bindings for the extension system.
@@ -30,7 +27,7 @@ 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