Use a direct include of strings headers in chrome/renderer/.

chrome/renderer/mock_printer.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/renderer/mock_printer.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/shared_memory.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/print_messages.h"
 #include "ipc/ipc_message_utils.h"
 #include "printing/metafile_impl.h"
 #include "printing/units.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_MACOSX)
 #include "printing/pdf_metafile_cg_mac.h"
 #endif
@@ skipping 293 matching lines @@
   params->margin_top = margin_top_;
   params->is_first_request = is_first_request_;
   params->print_scaling_option = print_scaling_option_;
   params->print_to_pdf = print_to_pdf_;
   params->preview_request_id = preview_request_id_;
   params->display_header_footer = display_header_footer_;
   params->date = date_;
   params->title = title_;
   params->url = url_;
 }