back out warren's fix for Bug #21686 as this broke mailnews. regression Bug #25511

a=leaf

netwerk/base/src/nsIOService.cpp

@@ -154,7 +154,6 @@ nsIOService::GetProtocolHandler(const char* scheme, nsIProtocolHandler* *result)
     char buf[MAX_NET_PROGID_LENGTH];
     nsCAutoString progID(NS_NETWORK_PROTOCOL_PROGID_PREFIX);
     progID += scheme;
-    progID.ToLowerCase();
     progID.ToCString(buf, MAX_NET_PROGID_LENGTH);
 
     rv = nsServiceManager::GetService(buf, NS_GET_IID(nsIProtocolHandler), (nsISupports **)result);