Make printing build on Win64

printing/print_destination_win.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 "printing/print_destination_interface.h"
 
+#include "base/safe_numerics.h"
 #include "base/win/metro.h"
 #include "win8/util/win8_util.h"
 
 namespace printing {
 
 class PrintDestinationWin : public PrintDestinationInterface {
  public:
   PrintDestinationWin()
       : metro_set_print_page_count_(NULL),
         metro_set_print_page_content_(NULL) {
     HMODULE metro_module = base::win::GetMetroModule();
     if (metro_module != NULL) {
       metro_set_print_page_count_ =
           reinterpret_cast<MetroSetPrintPageCount>(
               ::GetProcAddress(metro_module, "MetroSetPrintPageCount"));
       metro_set_print_page_content_ =
           reinterpret_cast<MetroSetPrintPageContent>(
               ::GetProcAddress(metro_module, "MetroSetPrintPageContent"));
     }
   }
   virtual void SetPageCount(int page_count) {
     if (metro_set_print_page_count_)
       metro_set_print_page_count_(page_count);
   }
 
   virtual void SetPageContent(int page_number,
                               void* content,
                               size_t content_size) {
     if (metro_set_print_page_content_)
-      metro_set_print_page_content_(page_number - 1, content, content_size);
+      metro_set_print_page_content_(page_number - 1, content,
+          base::checked_numeric_cast<UINT32>(content_size));
   }
  private:
   typedef void (*MetroSetPrintPageCount)(INT);
   typedef void (*MetroSetPrintPageContent)(INT, VOID*, UINT32);
   MetroSetPrintPageCount metro_set_print_page_count_;
   MetroSetPrintPageContent metro_set_print_page_content_;
 };
 
 PrintDestinationInterface* CreatePrintDestination() {
   // We currently only support the Metro print destination.
   if (win8::IsSingleWindowMetroMode())
     return new PrintDestinationWin;
   else
     return NULL;
 }
 
 }  // namespace printing