Printing: Load the source PDF only once.

chrome/browser/printing/pdf_to_emf_converter.cc

Index: chrome/browser/printing/pdf_to_emf_converter.cc
diff --git a/chrome/browser/printing/pdf_to_emf_converter.cc b/chrome/browser/printing/pdf_to_emf_converter.cc
index fb0be329e76d0325e4b0c20645adf832fb1d3303..0a0eb0915bb66ba51cabdc88f52b5c5becd3fb0a 100644
--- a/chrome/browser/printing/pdf_to_emf_converter.cc
+++ b/chrome/browser/printing/pdf_to_emf_converter.cc
@@ -340,7 +340,7 @@ void PdfToEmfUtilityProcessHostClient::OnTempPdfReady(bool print_text_with_gdi,
   if (!utility_process_host_ || !pdf)
     return OnFailed();
   // Should reply with OnPageCount().
-  Send(new ChromeUtilityMsg_RenderPDFPagesToMetafiles(
+  Send(new ChromeUtilityMsg_RenderPDFPagesToMetafiles_Start(
       IPC::GetPlatformFileForTransit(pdf->GetPlatformFile(), false), settings_,
       print_text_with_gdi));
 }