Fix autoupdate_EndToEndTest on veyron_rialto

chrome/browser/chromeos/login/screens/mock_model_view_channel.cc

Index: chrome/browser/chromeos/login/screens/mock_model_view_channel.cc
diff --git a/chrome/browser/chromeos/login/screens/mock_model_view_channel.cc b/chrome/browser/chromeos/login/screens/mock_model_view_channel.cc
new file mode 100644
index 0000000000000000000000000000000000000000..994beec847ff7e9a245a530b3e044dc7ad9338af
--- /dev/null
+++ b/chrome/browser/chromeos/login/screens/mock_model_view_channel.cc
@@ -0,0 +1,12 @@
+// Copyright 2017 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/login/screens/mock_model_view_channel.h"
+
+namespace chromeos {
+
+MockModelViewChannel::MockModelViewChannel() {}
+MockModelViewChannel::~MockModelViewChannel() {}
+
+}  // namespace chromeos