Rewrite std::string("") to std::string(), Linux edition.

net/base/dns_util.cc

 // Copyright (c) 2011 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/base/dns_util.h"
 
 #include <cstring>
 
 namespace net {
 
@@ skipping 44 matching lines @@
   *out = std::string(name, namelen);
   return true;
 }
 
 std::string DNSDomainToString(const base::StringPiece& domain) {
   std::string ret;
 
   for (unsigned i = 0; i < domain.size() && domain[i]; i += domain[i] + 1) {
 #if CHAR_MIN < 0
     if (domain[i] < 0)
-      return "";
+      return std::string();
 #endif
     if (domain[i] > 63)
-      return "";
+      return std::string();
 
     if (i)
       ret += ".";
 
     if (static_cast<unsigned>(domain[i]) + i + 1 > domain.size())
-      return "";
+      return std::string();
 
     domain.substr(i + 1, domain[i]).AppendToString(&ret);
   }
   return ret;
 }
 
 bool IsSTD3ASCIIValidCharacter(char c) {
   if (c <= 0x2c)
     return false;
   if (c >= 0x7b)
@@ skipping 10 matching lines @@
 std::string TrimEndingDot(const base::StringPiece& host) {
   base::StringPiece host_trimmed = host;
   size_t len = host_trimmed.length();
   if (len > 1 && host_trimmed[len - 1] == '.') {
     host_trimmed.remove_suffix(1);
   }
   return host_trimmed.as_string();
 }
 
 }  // namespace net