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

chrome/browser/printing/pdf_to_emf_converter.h

Index: chrome/browser/printing/pdf_to_emf_converter.h
diff --git a/chrome/browser/printing/pdf_to_emf_converter.h b/chrome/browser/printing/pdf_to_emf_converter.h
index 86afb0595c30471bf0c1632159b9a61890fd02c7..0ad5a1a152cd748d7565c06ea73c8102bfec6110 100644
--- a/chrome/browser/printing/pdf_to_emf_converter.h
+++ b/chrome/browser/printing/pdf_to_emf_converter.h
@@ -7,6 +7,7 @@
 
 #include "base/callback.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/memory/scoped_vector.h"
 
 namespace base {
 class FilePath;
@@ -18,11 +19,14 @@ class PdfRenderSettings;
 
 namespace printing {
 
+class Metafile;
+
 class PdfToEmfConverter {
  public:
   // Callback for when the PDF is converted to an EMF.
-  typedef base::Callback<void(double /*scale_factor*/,
-                              const std::vector<base::FilePath>& /*emf_files*/)>
+  // Takes ownership of metafiles.
+  typedef base::Callback<
+      void(double /*scale_factor*/, ScopedVector<Metafile>* /*emf_files*/)>
       ResultCallback;
   virtual ~PdfToEmfConverter() {}