Extract the certificate to use in the download protection pingback.

chrome/browser/safe_browsing/download_protection_service.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Helper class which handles communication with the SafeBrowsing servers for
 // improved binary download protection.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_DOWNLOAD_PROTECTION_SERVICE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_DOWNLOAD_PROTECTION_SERVICE_H_
 #pragma once
@@ skipping 10 matching lines @@
 #include "googleurl/src/gurl.h"
 
 namespace net {
 class URLRequestContextGetter;
 class URLRequestStatus;
 }  // namespace net
 class DownloadItem;
 class SafeBrowsingService;
 
 namespace safe_browsing {
+class SignatureUtil;
 
 // This class provides an asynchronous API to check whether a particular
 // client download is malicious or not.
 class DownloadProtectionService {
  public:
   // TODO(noelutz): we're missing some fields here: server IPs,
   // tab URL redirect chain, ...
   struct DownloadInfo {
     FilePath local_file;
     std::vector<GURL> download_url_chain;
@@ skipping 93 matching lines @@
   scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
 
   // Map of client download request to the corresponding callback that
   // has to be invoked when the request is done.  This map contains all
   // pending server requests.
   std::set<scoped_refptr<CheckClientDownloadRequest> > download_requests_;
 
   // Keeps track of the state of the service.
   bool enabled_;
 
+  // SignatureUtil object, may be overridden for testing.
+  scoped_refptr<SignatureUtil> signature_util_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadProtectionService);
 };
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_DOWNLOAD_PROTECTION_SERVICE_H_