Cleanup: Don't bother doing no-op wide/utf16 conversions on Windows.

ui/shell_dialogs/select_file_dialog_win.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 "ui/shell_dialogs/select_file_dialog_win.h"
 
 #include <shlobj.h>
 
 #include <algorithm>
 #include <set>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/i18n/case_conversion.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/tuple.h"
 #include "base/win/registry.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/shortcut.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/win/open_file_name_win.h"
@@ skipping 98 matching lines @@
       std::wstring ext_name = first_extension;
       size_t ext_index = ext_name.find_first_not_of(L'.');
       if (ext_index != std::wstring::npos)
         ext_name = ext_name.substr(ext_index);
 
       if (!GetRegistryDescriptionFromExtension(first_extension, &desc)) {
         // The extension doesn't exist in the registry. Create a description
         // based on the unknown extension type (i.e. if the extension is .qqq,
         // the we create a description "QQQ File (.qqq)").
         include_all_files = true;
-        desc = l10n_util::GetStringFUTF16(
-            IDS_APP_SAVEAS_EXTENSION_FORMAT,
-            base::i18n::ToUpper(base::WideToUTF16(ext_name)),
-            ext_name);
+        desc = l10n_util::GetStringFUTF16(IDS_APP_SAVEAS_EXTENSION_FORMAT,
+                                          base::i18n::ToUpper(ext_name),
+                                          ext_name);
       }
       if (desc.empty())
         desc = L"*." + ext_name;
     }
 
     result.append(desc.c_str(), desc.size() + 1);  // Append NULL too.
     result.append(ext.c_str(), ext.size() + 1);
   }
 
   if (include_all_files) {
@@ skipping 617 matching lines @@
 SelectFileDialog* CreateDefaultWinSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy) {
   return CreateWinSelectFileDialog(listener,
                                    policy,
                                    base::Bind(&CallBuiltinGetOpenFileName),
                                    base::Bind(&CallBuiltinGetSaveFileName));
 }
 
 }  // namespace ui