[Downloads] Move client guid for AV scanning of downloaded files to chrome/

content/browser/download/download_manager_impl.cc

Index: content/browser/download/download_manager_impl.cc
diff --git a/content/browser/download/download_manager_impl.cc b/content/browser/download/download_manager_impl.cc
index f924183261b203256a404240459205e18c6becb9..ccfb4cc0a5111a7eb5fcfd0ba87060ded15cf770 100644
--- a/content/browser/download/download_manager_impl.cc
+++ b/content/browser/download/download_manager_impl.cc
@@ -422,6 +422,13 @@ void DownloadManagerImpl::StartDownloadWithId(
           delegate_->GenerateFileHash(),
           stream.Pass(), download->GetBoundNetLog(),
           download->DestinationObserverAsWeakPtr()));
+
+  // Attach the client ID identifying the app to the AV system.
+  if (download_file.get() && delegate_) {
+    download_file->SetClientGuid(
+        delegate_->ApplicationClientIdForFileScanning());
+  }
+
   scoped_ptr<DownloadRequestHandleInterface> req_handle(
       new DownloadRequestHandle(info->request_handle));
   download->Start(download_file.Pass(), req_handle.Pass());