Don't free id before accessing it.

chrome/browser/extensions/updater/extension_downloader.cc

 // Copyright (c) 2012 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/extensions/updater/extension_downloader.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 703 matching lines @@
         extensions_queue_.active_request_failure_count() < kMaxRetries) {
       extensions_queue_.RetryRequest(backoff_delay);
     } else {
       RETRY_HISTOGRAM("CrxFetchFailure",
                       extensions_queue_.active_request_failure_count(), url);
       // status.error() is 0 (net::OK) or negative. (See net/base/net_errors.h)
       UMA_HISTOGRAM_SPARSE_SLOWLY("Extensions.CrxFetchError", -status.error());
       delegate_->OnExtensionDownloadFailed(
           id, ExtensionDownloaderDelegate::CRX_FETCH_FAILED, ping, request_ids);
     }
+    ping_results_.erase(id);
     extensions_queue_.reset_active_request();
-    ping_results_.erase(id);
   }
 
   extension_fetcher_.reset();
 
   // If there are any pending downloads left, start the next one.
   extensions_queue_.StartNextRequest();
 }
 
 void ExtensionDownloader::NotifyExtensionsDownloadFailed(
     const std::set<std::string>& extension_ids,
@@ skipping 10 matching lines @@
 void ExtensionDownloader::NotifyUpdateFound(const std::string& id,
                                             const std::string& version) {
   UpdateDetails updateInfo(id, Version(version));
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_UPDATE_FOUND,
       content::NotificationService::AllBrowserContextsAndSources(),
       content::Details<UpdateDetails>(&updateInfo));
 }
 
 }  // namespace extensions