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

chrome/browser/external_protocol/external_protocol_handler.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 327 matching lines @@
       return;
   }
   UMA_HISTOGRAM_ENUMERATION(kHandleStateMetric, handle_state,
                             HANDLE_STATE_LAST);
 }
 
 // static
 void ExternalProtocolHandler::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kExcludedSchemes);
 }
+
+// static
+void ExternalProtocolHandler::ClearData(Profile* profile) {
+  PrefService* prefs = profile->GetPrefs();
+  prefs->ClearPref(prefs::kExcludedSchemes);
+}