Add NULL check in OnPdfToEmfConverted

chrome/browser/printing/print_view_manager_base.cc

Index: chrome/browser/printing/print_view_manager_base.cc
diff --git a/chrome/browser/printing/print_view_manager_base.cc b/chrome/browser/printing/print_view_manager_base.cc
index e08037925c5697f9105ca4ec6dc03bd0b5a4724b..4e15b1d94aa8f334ed2b2ebfa62b3ecc9a021974 100644
--- a/chrome/browser/printing/print_view_manager_base.cc
+++ b/chrome/browser/printing/print_view_manager_base.cc
@@ -134,6 +134,9 @@ void PrintViewManagerBase::OnPdfToEmfConverted(
     const PrintHostMsg_DidPrintPage_Params& params,
     double scale_factor,
     const std::vector<base::FilePath>& emf_files) {
+  if (!print_job_.get())
+    return;
+
   PrintedDocument* document = print_job_->document();
   if (!document)
     return;