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

webkit/fileapi/copy_or_move_file_validator_unittest.cc

 // Copyright 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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 40 matching lines @@
     // Prepare the origin's root directory.
     if (src_type_ == kFileSystemTypeNativeMedia) {
       base::FilePath src_path = base_dir.Append(FILE_PATH_LITERAL("src_media"));
       file_util::CreateDirectory(src_path);
       src_fsid_ = IsolatedContext::GetInstance()->RegisterFileSystemForPath(
           kFileSystemTypeNativeMedia, src_path, NULL);
     } else {
       FileSystemMountPointProvider* mount_point_provider =
           file_system_context_->GetMountPointProvider(src_type_);
       mount_point_provider->GetFileSystemRootPathOnFileThread(
-          SourceURL(""),
-          true /* create */);
+          SourceURL(std::string()), true /* create */);
     }
     DCHECK_EQ(kFileSystemTypeNativeMedia, dest_type_);
     base::FilePath dest_path = base_dir.Append(FILE_PATH_LITERAL("dest_media"));
     file_util::CreateDirectory(dest_path);
     dest_fsid_ = IsolatedContext::GetInstance()->RegisterFileSystemForPath(
         kFileSystemTypeNativeMedia, dest_path, NULL);
 
     copy_src_ = SourceURL("copy_src.jpg");
     move_src_ = SourceURL("move_src.jpg");
     copy_dest_ = DestURL("copy_dest.jpg");
@@ skipping 196 matching lines @@
 
   scoped_ptr<CopyOrMoveFileValidatorFactory> accept_factory(
       new TestCopyOrMoveFileValidatorFactory(true /*accept_all*/));
   helper.SetMediaCopyOrMoveFileValidatorFactory(accept_factory.Pass());
 
   helper.CopyTest(base::PLATFORM_FILE_ERROR_SECURITY);
   helper.MoveTest(base::PLATFORM_FILE_ERROR_SECURITY);
 }
 
 }  // namespace fileapi