Clears out external protocol data when cookies and site data is cleared.

chrome/browser/external_protocol/external_protocol_handler.h

Index: chrome/browser/external_protocol/external_protocol_handler.h
diff --git a/chrome/browser/external_protocol/external_protocol_handler.h b/chrome/browser/external_protocol/external_protocol_handler.h
index 30a1600a9a7317dec158363df6449857ae7fa49b..671626f7c11fe4a41cc4ed8dee9556a6017eae59 100644
--- a/chrome/browser/external_protocol/external_protocol_handler.h
+++ b/chrome/browser/external_protocol/external_protocol_handler.h
@@ -140,6 +140,9 @@ class ExternalProtocolHandler {
                                         ui::PageTransition page_transition,
                                         bool has_user_gesture);
 
+  // Clears the external protocol handling data.
+  static void ClearData(Profile* profile);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternalProtocolHandler);
 };