Replace string16 with base::string16.

chrome/browser/download/save_package_file_picker.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 "chrome/browser/download/save_package_file_picker.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/file_util_icu.h"
 #include "base/metrics/histogram.h"
@@ skipping 187 matching lines @@
 
     file_type_info.include_all_files = true;
     file_type_index = 1;
   }
 
   if (g_should_prompt_for_filename) {
     select_file_dialog_ = ui::SelectFileDialog::Create(
         this, new ChromeSelectFilePolicy(web_contents));
     select_file_dialog_->SelectFile(
         ui::SelectFileDialog::SELECT_SAVEAS_FILE,
-        string16(),
+        base::string16(),
         suggested_path_copy,
         &file_type_info,
         file_type_index,
         default_extension_copy,
         platform_util::GetTopLevel(web_contents->GetView()->GetNativeView()),
         NULL);
   } else {
     // Just use 'suggested_path_copy' instead of opening the dialog prompt.
     // Go through FileSelected() for consistency.
     FileSelected(suggested_path_copy, file_type_index, NULL);
@@ skipping 61 matching lines @@
   }
 #endif
 
   callback_.Run(path_copy, save_type,
                 base::Bind(&OnSavePackageDownloadCreated));
 }
 
 void SavePackageFilePicker::FileSelectionCanceled(void* unused_params) {
   delete this;
 }