Tweaks to SharedMemory to avoid CHECK when printing

components/printing/renderer/print_web_view_helper_pdf_win.cc

Index: components/printing/renderer/print_web_view_helper_pdf_win.cc
diff --git a/components/printing/renderer/print_web_view_helper_pdf_win.cc b/components/printing/renderer/print_web_view_helper_pdf_win.cc
index aa196bb6a2c1bdccf901d0f24dbc31039db95e81..a85e2a10feaa4aa0042e43fda2648570a15615c4 100644
--- a/components/printing/renderer/print_web_view_helper_pdf_win.cc
+++ b/components/printing/renderer/print_web_view_helper_pdf_win.cc
@@ -110,7 +110,7 @@ bool PrintWebViewHelper::PrintPagesNative(blink::WebFrame* frame,
     printed_page_params.page_size = page_size_in_dpi[i];
     printed_page_params.content_area = content_area_in_dpi[i];
     Send(new PrintHostMsg_DidPrintPage(routing_id(), printed_page_params));
-    printed_page_params.metafile_data_handle = INVALID_HANDLE_VALUE;
+    printed_page_params.metafile_data_handle = NULL;
   }
   return true;
 }