Use new API to download blobs from Google Drive.

components/drive/service/drive_api_service.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 "components/drive/service/drive_api_service.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <vector>
@@ skipping 232 matching lines @@
     return;
   batch_request_->Commit();
   batch_request_.reset();
 }
 
 DriveAPIService::DriveAPIService(
     OAuth2TokenService* oauth2_token_service,
     net::URLRequestContextGetter* url_request_context_getter,
     base::SequencedTaskRunner* blocking_task_runner,
     const GURL& base_url,
-    const GURL& base_download_url,
     const GURL& base_thumbnail_url,
     const std::string& custom_user_agent)
     : oauth2_token_service_(oauth2_token_service),
       url_request_context_getter_(url_request_context_getter),
       blocking_task_runner_(blocking_task_runner),
-      url_generator_(base_url, base_download_url, base_thumbnail_url),
+      url_generator_(base_url, base_thumbnail_url),
       custom_user_agent_(custom_user_agent) {
 }
 
 DriveAPIService::~DriveAPIService() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (sender_.get())
     sender_->auth_service()->RemoveObserver(this);
 }
 
 void DriveAPIService::Initialize(const std::string& account_id) {
@@ skipping 598 matching lines @@
   // reference to RequestSender and we should ensure to delete the request when
   // the sender is deleted. Resolve the circulating dependency and fix it.
   const google_apis::CancelCallback callback =
       sender_->StartRequestWithAuthRetry(request.release());
   return base::WrapUnique<BatchRequestConfiguratorInterface>(
       new BatchRequestConfigurator(weak_ref, sender_->blocking_task_runner(),
                                    url_generator_, callback));
 }
 
 }  // namespace drive