Implement a module system for the extension bindings JS.

chrome/renderer/extensions/custom_bindings_util.h

Index: chrome/renderer/extensions/custom_bindings_util.h
diff --git a/chrome/renderer/extensions/custom_bindings_util.h b/chrome/renderer/extensions/custom_bindings_util.h
index 8b0b4290bf8d97c7671bf0b464b7000f2e707697..e4dd9f2bae6bd2fb32aefc1848df340cb4492cfd 100644
--- a/chrome/renderer/extensions/custom_bindings_util.h
+++ b/chrome/renderer/extensions/custom_bindings_util.h
@@ -11,6 +11,7 @@
 
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 
+class ChromeV8Extension;
 class Extension;
 class ExtensionDispatcher;
 
@@ -25,7 +26,8 @@ namespace extensions {
 namespace custom_bindings_util {
 
 // Creates V8 extensions for all custom bindings.
-std::vector<v8::Extension*> GetAll(ExtensionDispatcher* extension_dispatcher);
+std::vector<ChromeV8Extension*> GetAll(
+    ExtensionDispatcher* extension_dispatcher);
 
 // Extracts the name of an API from the name of the V8 extension which contains
 // custom bindings for it.