Remove DeleteTask and convert remaining users.

chrome/browser/safe_browsing/download_protection_service.cc

 // 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.
 
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/message_loop_helpers.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/time.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 #include "chrome/browser/safe_browsing/signature_util.h"
 #include "chrome/common/net/http_return.h"
 #include "chrome/common/safe_browsing/csd.pb.h"
@@ skipping 427 matching lines @@
     // We don't need the fetcher anymore.
     fetcher_.reset();
     RecordImprovedProtectionStats(reason);
     UMA_HISTOGRAM_TIMES("SBClientDownload.DownloadRequestDuration",
                         base::TimeTicks::Now() - start_time_);
     FinishRequest(result);
   }
 
  private:
   friend struct BrowserThread::DeleteOnThread<BrowserThread::UI>;
-  friend class DeleteTask<CheckClientDownloadRequest>;
+  friend class base::DeleteHelper<CheckClientDownloadRequest>;
 
   virtual ~CheckClientDownloadRequest() {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   }
 
   void ExtractFileFeatures() {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
     signature_util_->CheckSignature(info_.local_file, &signature_info_);
     bool is_signed = (signature_info_.certificate_chain_size() > 0);
     if (is_signed) {
@@ skipping 372 matching lines @@
 
   std::string issuer_fp = base::HexEncode(issuer.fingerprint().data,
                                           sizeof(issuer.fingerprint().data));
   for (std::set<std::string>::iterator it = paths_to_check.begin();
        it != paths_to_check.end(); ++it) {
     whitelist_strings->push_back("cert/" + issuer_fp + *it);
   }
 }
 
 }  // namespace safe_browsing