Cleanup: Pass std::string as const reference from media/

media/cast/test/receiver.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 <algorithm>
 #include <climits>
 #include <cstdarg>
 #include <cstdio>
 #include <deque>
 #include <map>
@@ skipping 57 matching lines @@
 void GetPorts(uint16* tx_port, uint16* rx_port) {
   test::InputBuilder tx_input(
       "Enter send port.", DEFAULT_SEND_PORT, 1, 65535);
   *tx_port = static_cast<uint16>(tx_input.GetIntInput());
 
   test::InputBuilder rx_input(
       "Enter receive port.", DEFAULT_RECEIVE_PORT, 1, 65535);
   *rx_port = static_cast<uint16>(rx_input.GetIntInput());
 }
 
-std::string GetIpAddress(const std::string display_text) {
+std::string GetIpAddress(const std::string& display_text) {
   test::InputBuilder input(display_text, DEFAULT_SEND_IP, INT_MIN, INT_MAX);
   std::string ip_address = input.GetStringInput();
   // Ensure IP address is either the default value or in correct form.
   while (ip_address != DEFAULT_SEND_IP &&
          std::count(ip_address.begin(), ip_address.end(), '.') != 3) {
     ip_address = input.GetStringInput();
   }
   return ip_address;
 }
 
@@ skipping 502 matching lines @@
                                   audio_config,
                                   video_config,
                                   window_width,
                                   window_height);
   player.Start();
 
   base::MessageLoop().Run();  // Run forever (i.e., until SIGTERM).
   NOTREACHED();
   return 0;
 }