Replace string16 with base::string16.

chrome/browser/chromeos/extensions/file_manager/file_browser_handler_api.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.
 
 // The file contains the implementation of
 // fileBrowserHandlerInternal.selectFile extension function.
 // When invoked, the function does the following:
 //  - Verifies that the extension function was invoked as a result of user
 //    gesture.
 //  - Display 'save as' dialog using FileSelectorImpl which waits for the user
@@ skipping 193 matching lines @@
 
   dialog_ = ui::SelectFileDialog::Create(
       this, new ChromeSelectFilePolicy(web_contents));
 
   // Convert |allowed_extensions| to ui::SelectFileDialog::FileTypeInfo.
   ui::SelectFileDialog::FileTypeInfo allowed_file_info =
       ConvertExtensionsToFileTypeInfo(allowed_extensions);
   allowed_file_info.support_drive = true;
 
   dialog_->SelectFile(ui::SelectFileDialog::SELECT_SAVEAS_FILE,
-                      string16() /* dialog title*/,
+                      base::string16() /* dialog title*/,
                       suggested_name,
                       &allowed_file_info,
                       0 /* file type index */,
                       std::string() /* default file extension */,
                       browser->window()->GetNativeWindow(), NULL /* params */);
 
   return dialog_->IsRunning(browser->window()->GetNativeWindow());
 }
 
 void FileSelectorImpl::FileSelected(
@@ skipping 134 matching lines @@
     result->entry.reset(new FileEntryInfo());
     result->entry->file_system_name = file_system_name_;
     result->entry->file_system_root = file_system_root_.spec();
     result->entry->file_full_path = "/" + virtual_path_.AsUTF8Unsafe();
     result->entry->file_is_directory = false;
   }
 
   results_ = SelectFile::Results::Create(*result);
   SendResponse(true);
 }