Delete temporarily dir for PDF to EMF conversion after all EMF files closed.

printing/emf_win.h

Index: printing/emf_win.h
diff --git a/printing/emf_win.h b/printing/emf_win.h
index fa274091f20f4e8715fe9b985c76ca2a5d2d0bd2..e31e20475aae425637d806ea82e269013b90c624 100644
--- a/printing/emf_win.h
+++ b/printing/emf_win.h
@@ -42,6 +42,9 @@ class PRINTING_EXPORT Emf : public Metafile {
   Emf();
   virtual ~Emf();
 
+  // Closes metafile.
+  void Close();
+
   // Generates a new metafile that will record every GDI command, and will
   // be saved to |metafile_path|.
   virtual bool InitToFile(const base::FilePath& metafile_path);