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

base/pickle_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 <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/pickle.h"
 #include "base/string16.h"
@@ skipping 116 matching lines @@
 
   Pickle pickle(reinterpret_cast<char*>(buffer), sizeof(buffer));
 
   PickleIterator iter(pickle);
   int data;
   EXPECT_FALSE(pickle.ReadInt(&iter, &data));
 }
 
 TEST(PickleTest, ZeroLenStr) {
   Pickle pickle;
-  EXPECT_TRUE(pickle.WriteString(""));
+  EXPECT_TRUE(pickle.WriteString(std::string()));
 
   PickleIterator iter(pickle);
   std::string outstr;
   EXPECT_TRUE(pickle.ReadString(&iter, &outstr));
   EXPECT_EQ("", outstr);
 }
 
 TEST(PickleTest, ZeroLenWStr) {
   Pickle pickle;
-  EXPECT_TRUE(pickle.WriteWString(L""));
+  EXPECT_TRUE(pickle.WriteWString(std::wstring()));
 
   PickleIterator iter(pickle);
   std::string outstr;
   EXPECT_TRUE(pickle.ReadString(&iter, &outstr));
   EXPECT_EQ("", outstr);
 }
 
 TEST(PickleTest, BadLenStr) {
   Pickle pickle;
   EXPECT_TRUE(pickle.WriteInt(-2));
@@ skipping 175 matching lines @@
   EXPECT_TRUE(pickle.WriteBytes(&data, sizeof(data)));
 
   PickleIterator iter(pickle);
   const char* outdata_char = NULL;
   EXPECT_TRUE(pickle.ReadBytes(&iter, &outdata_char, sizeof(data)));
 
   int outdata;
   memcpy(&outdata, outdata_char, sizeof(outdata));
   EXPECT_EQ(data, outdata);
 }