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

webkit/fileapi/local_file_system_cross_operation_unittest.cc

 // Copyright (c) 2013 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 <map>
 #include <queue>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 53 matching lines @@
         ExternalMountPoints::CreateRefCounted().get(),
         make_scoped_refptr(new quota::MockSpecialStoragePolicy),
         quota_manager_proxy_,
         base_dir,
         CreateAllowFileAccessOptions());
 
     // Prepare the origin's root directory.
     FileSystemMountPointProvider* mount_point_provider =
         file_system_context_->GetMountPointProvider(src_type_);
     mount_point_provider->GetFileSystemRootPathOnFileThread(
-        SourceURL(""),
-        true /* create */);
+        SourceURL(std::string()), true /* create */);
     mount_point_provider =
         file_system_context_->GetMountPointProvider(dest_type_);
     mount_point_provider->GetFileSystemRootPathOnFileThread(
-        DestURL(""),
-        true /* create */);
+        DestURL(std::string()), true /* create */);
 
     // Grant relatively big quota initially.
     quota_manager_->SetQuota(origin_,
                              FileSystemTypeToQuotaStorageType(src_type_),
                              1024 * 1024);
     quota_manager_->SetQuota(origin_,
                              FileSystemTypeToQuotaStorageType(dest_type_),
                              1024 * 1024);
   }
 
@@ skipping 325 matching lines @@
                              test::kRegularTestCaseSize);
 
   int64 src_new_usage = helper.GetSourceUsage();
   ASSERT_EQ(src_initial_usage, src_new_usage);
 
   int64 dest_increase = helper.GetDestUsage() - dest_initial_usage;
   ASSERT_EQ(src_increase, dest_increase);
 }
 
 }  // namespace fileapi