Propagate the SafeBrowsing download protection verdict to the DownloadItem.

chrome/browser/safe_browsing/download_protection_service.h

Index: chrome/browser/safe_browsing/download_protection_service.h
diff --git a/chrome/browser/safe_browsing/download_protection_service.h b/chrome/browser/safe_browsing/download_protection_service.h
index 60af4a27770f2968374696256362ace1893f8743..dd24436b0d1d66a533474f024634c37b8eb21104 100644
--- a/chrome/browser/safe_browsing/download_protection_service.h
+++ b/chrome/browser/safe_browsing/download_protection_service.h
@@ -86,6 +86,11 @@ class DownloadProtectionService {
   virtual void CheckDownloadUrl(const DownloadInfo& info,
                                 const CheckDownloadCallback& callback);
 
+  // Returns true iff the given filename has an extension that is supported
+  // by this service.  In other words: this method returns true if it can
+  // protect users against files with that particular extension.
+  bool IsSupportedFileType(const FilePath& filename) const;
+
   // Enables or disables the service.  This is usually called by the
   // SafeBrowsingService, which tracks whether any profile uses these services
   // at all.  Disabling causes any pending and future requests to have their