Cleanup: Pass std::string as const reference if possible

chromeos/network/shill_property_util.cc

 // Copyright 2013 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 "chromeos/network/shill_property_util.h"
 
 #include <set>
 
 #include "base/i18n/icu_encoding_detection.h"
 #include "base/i18n/icu_string_conversions.h"
@@ skipping 43 matching lines @@
   if (!source.GetStringWithoutPathExpansion(key, &string_value) ||
       string_value.empty()) {
     return false;
   }
   dest->SetStringWithoutPathExpansion(key, string_value);
   return true;
 }
 
 }  // namespace
 
-void SetSSID(const std::string ssid, base::DictionaryValue* properties) {
+void SetSSID(const std::string& ssid, base::DictionaryValue* properties) {
   std::string hex_ssid = base::HexEncode(ssid.c_str(), ssid.size());
   properties->SetStringWithoutPathExpansion(shill::kWifiHexSsid, hex_ssid);
 }
 
 std::string GetSSIDFromProperties(const base::DictionaryValue& properties,
                                   bool verbose_logging,
                                   bool* unknown_encoding) {
   if (unknown_encoding)
     *unknown_encoding = false;
 
@@ skipping 297 matching lines @@
     LOG(WARNING)
         << "Provider name and country not defined, using code instead: "
         << *home_provider_id;
   }
   return true;
 }
 
 }  // namespace shill_property_util
 
 }  // namespace chromeos