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

net/http/http_auth_unittest.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 <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_util.h"
@@ skipping 286 matching lines @@
   std::string challenge_str = "Basic realm=\"";
   HttpAuth::ChallengeTokenizer challenge(challenge_str.begin(),
                                          challenge_str.end());
   HttpUtil::NameValuePairsIterator parameters = challenge.param_pairs();
 
   EXPECT_TRUE(parameters.valid());
   EXPECT_EQ(std::string("Basic"), challenge.scheme());
   EXPECT_TRUE(parameters.GetNext());
   EXPECT_TRUE(parameters.valid());
   EXPECT_EQ(std::string("realm"), parameters.name());
-  EXPECT_EQ(std::string(""), parameters.value());
+  EXPECT_EQ(std::string(), parameters.value());
   EXPECT_FALSE(parameters.GetNext());
 }
 
 // Use a name=value property with mismatching quote marks and spaces in the
 // value.
 TEST(HttpAuthTest, ChallengeTokenizerMismatchedQuotesSpaces) {
   std::string challenge_str = "Basic realm=\"foo bar";
   HttpAuth::ChallengeTokenizer challenge(challenge_str.begin(),
                                          challenge_str.end());
   HttpUtil::NameValuePairsIterator parameters = challenge.param_pairs();
@@ skipping 108 matching lines @@
   std::string name;
 
   name = HttpAuth::GetAuthorizationHeaderName(HttpAuth::AUTH_SERVER);
   EXPECT_STREQ("Authorization", name.c_str());
 
   name = HttpAuth::GetAuthorizationHeaderName(HttpAuth::AUTH_PROXY);
   EXPECT_STREQ("Proxy-Authorization", name.c_str());
 }
 
 }  // namespace net