Add a Model to the download component.

components/download/public/download_params.cc

Index: components/download/public/download_params.cc
diff --git a/components/download/public/download_params.cc b/components/download/public/download_params.cc
index d0be2882e0161afb87532e929a671ba924d5d415..4378c51bf17b1e80fc271ec7f2704a603ad0dbf3 100644
--- a/components/download/public/download_params.cc
+++ b/components/download/public/download_params.cc
@@ -4,6 +4,8 @@
 
 #include "components/download/public/download_params.h"
 
+#include <map>

[xingliu, 2017/05/09 06:11:41]

nit: do we need this include?

[David Trainor- moved to gerrit, 2017/05/09 15:59:27]

Oops not anymore.

+
 #include "components/download/public/clients.h"
 
 namespace download {
@@ -15,8 +17,7 @@ SchedulingParams::SchedulingParams()
 
 RequestParams::RequestParams() : method("GET") {}
 
-DownloadParams::DownloadParams()
-    : client(DownloadClient::DOWNLOAD_CLIENT_INVALID) {}
+DownloadParams::DownloadParams() : client(DownloadClient::INVALID) {}
 
 DownloadParams::DownloadParams(const DownloadParams& other) = default;