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

base/process_util_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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 740 matching lines @@
   const int no_clone_flags = 0;
 
   env_changes.push_back(std::make_pair(std::string("BASE_TEST"),
                                        std::string("bar")));
   EXPECT_EQ("bar\n", TestLaunchProcess(env_changes, no_clone_flags));
   env_changes.clear();
 
   EXPECT_EQ(0, setenv("BASE_TEST", "testing", 1 /* override */));
   EXPECT_EQ("testing\n", TestLaunchProcess(env_changes, no_clone_flags));
 
-  env_changes.push_back(std::make_pair(std::string("BASE_TEST"),
-                                       std::string("")));
+  env_changes.push_back(
+      std::make_pair(std::string("BASE_TEST"), std::string()));
   EXPECT_EQ("\n", TestLaunchProcess(env_changes, no_clone_flags));
 
   env_changes[0].second = "foo";
   EXPECT_EQ("foo\n", TestLaunchProcess(env_changes, no_clone_flags));
 
   env_changes.clear();
   EXPECT_EQ(0, setenv("BASE_TEST", kLargeString, 1 /* override */));
   EXPECT_EQ(std::string(kLargeString) + "\n",
             TestLaunchProcess(env_changes, no_clone_flags));
 
@@ skipping 20 matching lines @@
   EXPECT_TRUE(e[0] == NULL);
   delete[] e;
 
   changes.push_back(std::make_pair(std::string("A"), std::string("1")));
   e = base::AlterEnvironment(changes, empty);
   EXPECT_EQ(std::string("A=1"), e[0]);
   EXPECT_TRUE(e[1] == NULL);
   delete[] e;
 
   changes.clear();
-  changes.push_back(std::make_pair(std::string("A"), std::string("")));
+  changes.push_back(std::make_pair(std::string("A"), std::string()));
   e = base::AlterEnvironment(changes, empty);
   EXPECT_TRUE(e[0] == NULL);
   delete[] e;
 
   changes.clear();
   e = base::AlterEnvironment(changes, a2);
   EXPECT_EQ(std::string("A=2"), e[0]);
   EXPECT_TRUE(e[1] == NULL);
   delete[] e;
 
   changes.clear();
   changes.push_back(std::make_pair(std::string("A"), std::string("1")));
   e = base::AlterEnvironment(changes, a2);
   EXPECT_EQ(std::string("A=1"), e[0]);
   EXPECT_TRUE(e[1] == NULL);
   delete[] e;
 
   changes.clear();
-  changes.push_back(std::make_pair(std::string("A"), std::string("")));
+  changes.push_back(std::make_pair(std::string("A"), std::string()));
   e = base::AlterEnvironment(changes, a2);
   EXPECT_TRUE(e[0] == NULL);
   delete[] e;
 }
 
 TEST_F(ProcessUtilTest, GetAppOutput) {
   std::string output;
 
 #if defined(OS_ANDROID)
   std::vector<std::string> argv;
@@ skipping 451 matching lines @@
       SetUpInDeathAssert();
       while ((value_ = base::AllocatePsychoticallyBigObjCObject())) {}
     }, "");
 }
 
 #endif  // !ARCH_CPU_64_BITS
 #endif  // OS_MACOSX
 
 #endif  // !defined(OS_ANDROID) && !defined(OS_OPENBSD) &&
         // !defined(OS_WIN) && !defined(ADDRESS_SANITIZER)