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

chrome/browser/external_protocol/external_protocol_handler.cc

Index: chrome/browser/external_protocol/external_protocol_handler.cc
diff --git a/chrome/browser/external_protocol/external_protocol_handler.cc b/chrome/browser/external_protocol/external_protocol_handler.cc
index 29f98ed5cc60d7d2187b9138a1103399772be326..36b9fdc51bd090b444a4d077784cb19eeb4ac90b 100644
--- a/chrome/browser/external_protocol/external_protocol_handler.cc
+++ b/chrome/browser/external_protocol/external_protocol_handler.cc
@@ -345,3 +345,9 @@ void ExternalProtocolHandler::RecordHandleStateMetrics(bool checkbox_selected,
 void ExternalProtocolHandler::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kExcludedSchemes);
 }
+
+// static
+void ExternalProtocolHandler::ClearData(Profile* profile) {
+  PrefService* prefs = profile->GetPrefs();
+  prefs->ClearPref(prefs::kExcludedSchemes);
+}