[SafeBrowsing] Alternate extensions should also be subject to block list.

chrome/browser/safe_browsing/unverified_download_policy.h

Index: chrome/browser/safe_browsing/unverified_download_policy.h
diff --git a/chrome/browser/safe_browsing/unverified_download_policy.h b/chrome/browser/safe_browsing/unverified_download_policy.h
index 170e92bfe8d57d2cb2d7342131813ee49c3f8dbb..e5001db575265726c67131e2ee29c744838eb7ea 100644
--- a/chrome/browser/safe_browsing/unverified_download_policy.h
+++ b/chrome/browser/safe_browsing/unverified_download_policy.h
@@ -5,14 +5,13 @@
 #ifndef CHROME_BROWSER_SAFE_BROWSING_UNVERIFIED_DOWNLOAD_POLICY_H_
 #define CHROME_BROWSER_SAFE_BROWSING_UNVERIFIED_DOWNLOAD_POLICY_H_
 
+#include <vector>
+
 #include "base/callback_forward.h"
+#include "base/files/file_path.h"
 
 class GURL;
 
-namespace base {
-class FilePath;
-}
-
 namespace safe_browsing {
 
 enum class UnverifiedDownloadPolicy { ALLOWED, DISALLOWED };
@@ -21,10 +20,13 @@ using UnverifiedDownloadCheckCompletionCallback =
     base::Callback<void(UnverifiedDownloadPolicy)>;
 
 // Invokes |callback| on the current thread with the effective download policy
-// for an unverified download of |file| by |requestor|.
+// for an unverified download of |file| by |requestor|. If it is possible for
+// the file to be downloaded with alternate file extensions, they should be
+// specified in |alternate_extensions|.
 void CheckUnverifiedDownloadPolicy(
     const GURL& requestor,
     const base::FilePath& file,
+    const std::vector<base::FilePath::StringType>& alternate_extensions,
     const UnverifiedDownloadCheckCompletionCallback& callback);
 
 }  // namespace safe_browsing