Decouple killbit testing from external extension providers

chrome/browser/extensions/stateful_external_extension_provider.h

Index: chrome/browser/extensions/stateful_external_extension_provider.h
diff --git a/chrome/browser/extensions/stateful_external_extension_provider.h b/chrome/browser/extensions/stateful_external_extension_provider.h
index 506873d64049aa692ae22b1d1ca5cea0635f5424..141f45d4fb1d42fdb2cc7faafc8c11dd0634e0f4 100644
--- a/chrome/browser/extensions/stateful_external_extension_provider.h
+++ b/chrome/browser/extensions/stateful_external_extension_provider.h
@@ -6,9 +6,6 @@
 #define CHROME_BROWSER_EXTENSIONS_STATEFUL_EXTERNAL_EXTENSION_PROVIDER_H_
 #pragma once
 
-#include <set>
-#include <string>
-
 #include "chrome/browser/extensions/external_extension_provider.h"
 
 class DictionaryValue;
@@ -35,8 +32,7 @@ class StatefulExternalExtensionProvider : public ExternalExtensionProvider {
   virtual ~StatefulExternalExtensionProvider();
 
   // ExternalExtensionProvider implementation:
-  virtual void VisitRegisteredExtension(
-      Visitor* visitor, const std::set<std::string>& ids_to_ignore) const;
+  virtual void VisitRegisteredExtension(Visitor* visitor) const;
 
   virtual bool HasExtension(const std::string& id) const;