[downloads] Correctly plumb client ID for download file scanning.

content/browser/download/download_manager_impl.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 "content/browser/download/download_manager_impl.h"
 
 #include <iterator>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 397 matching lines @@
 
 void DownloadManagerImpl::OnFileExistenceChecked(uint32_t download_id,
                                                  bool result) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!result) {  // File does not exist.
     if (base::ContainsKey(downloads_, download_id))
       downloads_[download_id]->OnDownloadedFileRemoved();
   }
 }
 
+std::string DownloadManagerImpl::GetApplicationClientIdForFileScanning() const {
+  if (delegate_)
+    return delegate_->ApplicationClientIdForFileScanning();
+  return std::string();
+}
+
 BrowserContext* DownloadManagerImpl::GetBrowserContext() const {
   return browser_context_;
 }
 
 void DownloadManagerImpl::CreateSavePackageDownloadItem(
     const base::FilePath& main_file_path,
     const GURL& page_url,
     const std::string& mime_type,
     std::unique_ptr<DownloadRequestHandleInterface> request_handle,
     const DownloadItemImplCreated& item_created) {
@@ skipping 326 matching lines @@
   if (delegate_)
     delegate_->OpenDownload(download);
 }
 
 void DownloadManagerImpl::ShowDownloadInShell(DownloadItemImpl* download) {
   if (delegate_)
     delegate_->ShowDownloadInShell(download);
 }
 
 }  // namespace content