Fix mash shelf height.

mash/wm/shelf_layout.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 "mash/wm/shelf_layout.h"
 
 #include "components/mus/public/cpp/property_type_converters.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_property.h"
 #include "mash/wm/property_util.h"
@@ skipping 10 matching lines @@
 // We explicitly don't make assertions about the number of children in this
 // layout as the number of children can vary when the application providing the
 // shelf restarts.
 
 void ShelfLayout::LayoutWindow(mus::Window* window) {
   gfx::Size preferred_size = GetWindowPreferredSize(window);
 
   gfx::Rect container_bounds = owner()->bounds();
   container_bounds.set_origin(
       gfx::Point(0, container_bounds.height() - preferred_size.height()));
+  container_bounds.set_height(preferred_size.height());
   window->SetBounds(container_bounds);
 }
 
 }  // namespace wm
 }  // namespace mash