Factor Chrome details out of update manifest fetching.

chrome/browser/chromeos/extensions/external_cache.cc

 // Copyright (c) 2013 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/chromeos/extensions/external_cache.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
+#include "chrome/browser/extensions/updater/chrome_extension_downloader_factory.h"
 #include "chrome/browser/extensions/updater/extension_downloader.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "extensions/browser/notification_types.h"
 #include "extensions/common/extension.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace chromeos {
@@ skipping 173 matching lines @@
   if (delegate_)
     delegate_->OnExtensionListsUpdated(cached_extensions_.get());
 }
 
 void ExternalCache::CheckCache() {
   if (local_cache_.is_shutdown())
     return;
 
   // If request_context_ is missing we can't download anything.
   if (!downloader_ && request_context_) {
-    downloader_.reset(
-        new extensions::ExtensionDownloader(this, request_context_));
+    downloader_ = ChromeExtensionDownloaderFactory::CreateForRequestContext(
+        request_context_, this);
   }
 
   cached_extensions_->Clear();
   for (base::DictionaryValue::Iterator it(*extensions_.get());
        !it.IsAtEnd(); it.Advance()) {
     const base::DictionaryValue* entry = NULL;
     if (!it.value().GetAsDictionary(&entry)) {
       LOG(ERROR) << "ExternalCache found bad entry with type "
                  << it.value().GetType();
       continue;
@@ skipping 96 matching lines @@
     delegate_->OnExtensionLoadedInCache(id);
   UpdateExtensionLoader();
 }
 
 std::string ExternalCache::Delegate::GetInstalledExtensionVersion(
     const std::string& id) {
   return std::string();
 }
 
 }  // namespace chromeos