Add support for a "split" incognito behavior for extensions.

chrome/browser/dom_ui/dom_ui_factory.cc

Index: chrome/browser/dom_ui/dom_ui_factory.cc
diff --git a/chrome/browser/dom_ui/dom_ui_factory.cc b/chrome/browser/dom_ui/dom_ui_factory.cc
index 251f64634bcd1b2c571f574791071cbc74cae6a3..dc9eec7e92ec9b8d6501caae767cf1a8277ddb73 100644
--- a/chrome/browser/dom_ui/dom_ui_factory.cc
+++ b/chrome/browser/dom_ui/dom_ui_factory.cc
@@ -61,7 +61,7 @@ DOMUI* NewDOMUI<ExtensionDOMUI>(TabContents* contents, const GURL& url) {
   ExtensionsService* service = contents->profile()->GetExtensionsService();
   bool valid_extension =
       (service && service->GetExtensionById(url.host(), false));
-  if (valid_extension && !contents->profile()->IsOffTheRecord())
+  if (valid_extension)
     return new ExtensionDOMUI(contents);
   return NULL;
 }