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

webkit/quota/quota_manager_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 <set>
 #include <sstream>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/file_util.h"
@@ skipping 1350 matching lines @@
   const int64 predelete_global_tmp = usage();
 
   GetHostUsage("foo.com", kTemp);
   MessageLoop::current()->RunUntilIdle();
   int64 predelete_host_tmp = usage();
 
   GetHostUsage("foo.com", kPerm);
   MessageLoop::current()->RunUntilIdle();
   int64 predelete_host_pers = usage();
 
-  DeleteHostData("", kTemp, kAllClients);
+  DeleteHostData(std::string(), kTemp, kAllClients);
   MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(kQuotaStatusOk, status());
 
   GetGlobalUsage(kTemp);
   MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(predelete_global_tmp, usage());
 
   GetHostUsage("foo.com", kTemp);
   MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(predelete_host_tmp, usage());
@@ skipping 666 matching lines @@
   EXPECT_EQ(predelete_foo_tmp - 2 - 1, usage());
 
   DeleteHostData("foo.com", kTemp,
       QuotaClient::kDatabase | QuotaClient::kIndexedDatabase);
   MessageLoop::current()->RunUntilIdle();
   GetHostUsage("foo.com", kTemp);
   MessageLoop::current()->RunUntilIdle();
   EXPECT_EQ(predelete_foo_tmp - 8 - 4 - 2 - 1, usage());
 }
 }  // namespace quota