Fix bug that caused us to have many duplicate registrations
recorded in extension prefs for override pages.

BUG=41442

Review URL: http://codereview.chromium.org/1518028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44551 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_dom_ui.h b/chrome/browser/extensions/extension_dom_ui.h
index d14eb692..87f57fc 100644
--- a/chrome/browser/extensions/extension_dom_ui.h
+++ b/chrome/browser/extensions/extension_dom_ui.h
@@ -26,6 +26,8 @@
     : public DOMUI,
       public ExtensionFunctionDispatcher::Delegate {
  public:
+  static const wchar_t kExtensionURLOverrides[];
+
   explicit ExtensionDOMUI(TabContents* tab_contents);
 
   ExtensionFunctionDispatcher* extension_function_dispatcher() const {