Update the remaining references to sys_string_conversions.h to its new location.

webkit/fileapi/file_system_mount_point_provider_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 <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "base/message_loop_proxy.h"
-#include "base/sys_string_conversions.h"
+#include "base/strings/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/fileapi/external_mount_points.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_task_runners.h"
 #include "webkit/fileapi/file_system_url.h"
 #include "webkit/fileapi/file_system_util.h"
 #include "webkit/fileapi/mock_file_system_options.h"
 #include "webkit/fileapi/sandbox_mount_point_provider.h"
@@ skipping 269 matching lines @@
                             kRootPathFileURITestCases[i].type,
                             true /* create */, &root_path));
     base::FilePath expected = file_system_path().AppendASCII(
         kRootPathFileURITestCases[i].expected_path);
     EXPECT_EQ(expected.value(), root_path.value());
     EXPECT_TRUE(file_util::DirectoryExists(root_path));
   }
 }
 
 }  // namespace fileapi