Makes WindowTreeHost::InitHost() not Show the window

ui/aura/mus/window_tree_host_mus.cc

 // Copyright 2015 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 "ui/aura/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/input_method_mus.h"
 #include "ui/aura/mus/window_port_mus.h"
@@ skipping 108 matching lines @@
 
 display::Display WindowTreeHostMus::GetDisplay() const {
   for (const display::Display& display :
        display::Screen::GetScreen()->GetAllDisplays()) {
     if (display.id() == display_id_)
       return display;
   }
   return display::Display();
 }
 
-void WindowTreeHostMus::ShowImpl() {
-  WindowTreeHostPlatform::ShowImpl();
-  window()->Show();
-}
-
 void WindowTreeHostMus::HideImpl() {
   WindowTreeHostPlatform::HideImpl();
   window()->Hide();
 }
 
 void WindowTreeHostMus::SetBoundsInPixels(const gfx::Rect& bounds) {
   if (!in_set_bounds_from_server_)
     delegate_->OnWindowTreeHostBoundsWillChange(this, bounds);
   WindowTreeHostPlatform::SetBoundsInPixels(bounds);
 }
@@ skipping 17 matching lines @@
 void WindowTreeHostMus::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
   // TODO: This should read the profile from mus. crbug.com/647510
   return gfx::ICCProfile();
 }
 
 }  // namespace aura