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

net/http/http_vary_data.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/http/http_vary_data.h"
 
 #include <stdlib.h>
 
 #include "base/pickle.h"
 #include "base/string_util.h"
@@ skipping 87 matching lines @@
     const HttpRequestInfo& request_info,
     const std::string& request_header) {
   // Unfortunately, we do not have access to all of the request headers at this
   // point.  Most notably, we do not have access to an Authorization header if
   // one will be added to the request.
 
   std::string result;
   if (request_info.extra_headers.GetHeader(request_header, &result))
     return result;
 
-  return "";
+  return std::string();
 }
 
 // static
 void HttpVaryData::AddField(const HttpRequestInfo& request_info,
                             const std::string& request_header,
                             base::MD5Context* ctx) {
   std::string request_value = GetRequestValue(request_info, request_header);
 
   // Append a character that cannot appear in the request header line so that we
   // protect against case where the concatenation of two request headers could
   // look the same for a variety of values for the individual request headers.
   // For example, "foo: 12\nbar: 3" looks like "foo: 1\nbar: 23" otherwise.
   request_value.append(1, '\n');
 
   base::MD5Update(ctx, request_value);
 }
 
 }  // namespace net