Use JS Date().toLocaleDateString() to format date in header.

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/memory/shared_memory.h"
 #include "base/strings/string16.h"
@@ skipping 54 matching lines @@
     document_cookie_(-1),
     current_document_cookie_(0),
     printer_status_(PRINTER_READY),
     number_pages_(0),
     page_number_(0),
     is_first_request_(true),
     print_to_pdf_(false),
     preview_request_id_(0),
     print_scaling_option_(WebKit::WebPrintScalingOptionSourceSize),
     display_header_footer_(false),
-    date_(ASCIIToUTF16("date")),
     title_(ASCIIToUTF16("title")),
     url_(ASCIIToUTF16("url")),
     use_invalid_settings_(false) {
   page_size_.SetSize(static_cast<int>(8.5 * dpi_),
                      static_cast<int>(11.0 * dpi_));
   content_size_.SetSize(static_cast<int>((7.5 * dpi_)),
                           static_cast<int>((10.0 * dpi_)));
   margin_left_ = margin_top_ = static_cast<int>(0.5 * dpi_);
   printable_area_.SetRect(static_cast<int>(0.25 * dpi_),
                           static_cast<int>(0.25 *dpi_),
@@ skipping 26 matching lines @@
   min_shrink_ = params.min_shrink;
   desired_dpi_ = params.desired_dpi;
   selection_only_ = params.selection_only;
   should_print_backgrounds_ = params.should_print_backgrounds;
   page_size_ = params.page_size;
   content_size_ = params.content_size;
   printable_area_ = params.printable_area;
   margin_left_ = params.margin_left;
   margin_top_ = params.margin_top;
   display_header_footer_ = params.display_header_footer;
-  date_ = params.date;
   title_ = params.title;
   url_ = params.url;
 }
 
 void MockPrinter::UseInvalidSettings() {
   use_invalid_settings_ = true;
   PrintMsg_Print_Params empty_param;
   SetDefaultPrintSettings(empty_param);
 }
 
@@ skipping 22 matching lines @@
   settings->params.should_print_backgrounds = should_print_backgrounds_;
   settings->params.document_cookie = document_cookie_;
   settings->params.page_size = page_size_;
   settings->params.content_size = content_size_;
   settings->params.printable_area = printable_area_;
   settings->params.is_first_request = is_first_request_;
   settings->params.print_scaling_option = print_scaling_option_;
   settings->params.print_to_pdf = print_to_pdf_;
   settings->params.preview_request_id = preview_request_id_;
   settings->params.display_header_footer = display_header_footer_;
-  settings->params.date = date_;
   settings->params.title = title_;
   settings->params.url = url_;
   printer_status_ = PRINTER_PRINTING;
 }
 
 void MockPrinter::UpdateSettings(int cookie,
                                  PrintMsg_PrintPages_Params* params,
                                  const std::vector<int>& pages,
                                  int margins_type) {
   if (document_cookie_ == -1) {
@@ skipping 129 matching lines @@
   params->page_size = page_size_;
   params->content_size = content_size_;
   params->printable_area = printable_area_;
   params->margin_left = margin_left_;
   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_;
 }