Update from https://crrev.com/311076

net/dns/dns_config_service_unittest.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 "net/dns/dns_config_service.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 23 matching lines @@
  protected:
   NameServerClassifier::NameServersType Classify(
       const std::string& servers_string) {
     std::vector<std::string> server_strings;
     base::SplitString(servers_string, ' ', &server_strings);
 
     std::vector<IPEndPoint> servers;
     for (std::vector<std::string>::const_iterator it = server_strings.begin();
          it != server_strings.end();
          ++it) {
-      if (*it == "")
+      if (it->empty())
         continue;
 
       IPAddressNumber address;
       bool parsed = ParseIPLiteralToNumber(*it, &address);
       EXPECT_TRUE(parsed);
       servers.push_back(IPEndPoint(address, dns_protocol::kDefaultPort));
     }
 
     return classifier_.GetNameServersType(servers);
   }
@@ skipping 288 matching lines @@
                                  base::Unretained(this)));
   base::TimeDelta kTimeout = TestTimeouts::action_max_timeout();
   WaitForConfig(kTimeout);
   ASSERT_TRUE(last_config_.IsValid()) << "Did not receive DnsConfig in " <<
       kTimeout.InSecondsF() << "s";
 }
 #endif  // OS_POSIX || OS_WIN
 
 }  // namespace net