Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/host/ash_window_tree_host_x11.cc

Index: ash/host/ash_window_tree_host_x11.cc
diff --git a/ash/host/ash_window_tree_host_x11.cc b/ash/host/ash_window_tree_host_x11.cc
index b9f33f1480748633c5b34d88e5ed13bfb1388856..a050a349f021cc26bd10af2f92763a52e51e9b03 100644
--- a/ash/host/ash_window_tree_host_x11.cc
+++ b/ash/host/ash_window_tree_host_x11.cc
@@ -12,6 +12,7 @@
 #include <string>
 #include <vector>
 
+#include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/root_window_transformer.h"
 #include "base/basictypes.h"
 #include "base/sys_info.h"
@@ -281,8 +282,9 @@ void AshWindowTreeHostX11::SetCrOSTapPaused(bool state) {
   }
 }
 
-AshWindowTreeHost* AshWindowTreeHost::Create(const gfx::Rect& initial_bounds) {
-  return new AshWindowTreeHostX11(initial_bounds);
+AshWindowTreeHost* AshWindowTreeHost::Create(
+    const AshWindowTreeHostInitParams& init_params) {
+  return new AshWindowTreeHostX11(init_params.initial_bounds);
 }
 
 }  // namespace ash