Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/host/ash_window_tree_host_init_params.cc

Index: ash/host/ash_window_tree_host_init_params.cc
diff --git a/ash/host/ash_window_tree_host_init_params.cc b/ash/host/ash_window_tree_host_init_params.cc
new file mode 100644
index 0000000000000000000000000000000000000000..55d15c03cbca2a27186cbb067667b95237c1d4d0
--- /dev/null
+++ b/ash/host/ash_window_tree_host_init_params.cc
@@ -0,0 +1,19 @@
+// Copyright 2014 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 "ash/host/ash_window_tree_host_init_params.h"
+
+namespace ash {
+
+#if defined(OS_WIN)
+AshWindowTreeHostInitParams::AshWindowTreeHostInitParams() : remote_hwnd(NULL) {
+#else
+AshWindowTreeHostInitParams::AshWindowTreeHostInitParams() {
+#endif
+}
+
+AshWindowTreeHostInitParams::~AshWindowTreeHostInitParams() {
+}
+
+}  // namespace ash