Support scoped_ptr in BrowserThread::DeleteOnThread.

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 21800ee6311e370862a549cded7790af4d4f50bf..4db648bed66387fb3dc61931da7d733ca407660c 100644
--- a/chrome/browser/printing/pdf_to_emf_converter.cc
+++ b/chrome/browser/printing/pdf_to_emf_converter.cc
@@ -125,7 +125,7 @@ class PdfToEmfUtilityProcessHostClient
       double scale_factor);
   void OnFilesReadyOnUIThread();
 
-  scoped_ptr<FileHandlers> files_;
+  scoped_ptr<FileHandlers, BrowserThread::DeleteOnFileThread> files_;
   printing::PdfRenderSettings settings_;
   PdfToEmfConverter::ResultCallback callback_;
   base::WeakPtr<content::UtilityProcessHost> utility_process_host_;
@@ -138,8 +138,6 @@ PdfToEmfUtilityProcessHostClient::PdfToEmfUtilityProcessHostClient(
     : settings_(settings) {}
 
 PdfToEmfUtilityProcessHostClient::~PdfToEmfUtilityProcessHostClient() {
-  // Delete temp directory.
-  BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, files_.release());
 }
 
 void PdfToEmfUtilityProcessHostClient::Convert(