ui/shell_dialogs: Use base::string16 now that string16 was moved into base namespace.

ui/shell_dialogs/gtk/select_file_dialog_impl.h

 // 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.
 //
 // This file implements common select dialog functionality between GTK and KDE.
 
 #ifndef UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 #define UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_
 
 #include <set>
@@ skipping 27 matching lines @@
 
  protected:
   explicit SelectFileDialogImpl(Listener* listener,
                                 ui::SelectFilePolicy* policy);
   virtual ~SelectFileDialogImpl();
 
   // SelectFileDialog implementation.
   // |params| is user data we pass back via the Listener interface.
   virtual void SelectFileImpl(
       Type type,
-      const string16& title,
+      const base::string16& title,
       const base::FilePath& default_path,
       const FileTypeInfo* file_types,
       int file_type_index,
       const base::FilePath::StringType& default_extension,
       gfx::NativeWindow owning_window,
       void* params) = 0;
 
   // Wrapper for file_util::DirectoryExists() that allow access on the UI
   // thread. Use this only in the file dialog functions, where it's ok
   // because the file dialog has to do many stats anyway. One more won't
@@ skipping 21 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialogImpl);
 };
 
 SelectFileDialog* CreateLinuxSelectFileDialog(
     SelectFileDialog::Listener* listener,
     SelectFilePolicy* policy);
 
 }  // namespace ui
 
 #endif  // UI_SHELL_DIALOGS_GTK_SELECT_FILE_DIALOG_IMPL_H_