Silence narrowing warning with XRectangle

ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc

 // Copyright (c) 2012 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/views/widget/desktop_aura/desktop_root_window_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 1035 matching lines @@
       Region region = gfx::CreateRegionFromSkPath(window_mask);
       XShapeCombineRegion(xdisplay_, xwindow_, ShapeBounding,
                           0, 0, region, false);
       XDestroyRegion(region);
       return;
     }
   }
 
   // If we didn't set the shape for any reason, reset the shaping information
   // by ShapeSet-ing with our bounds rect.
-  XRectangle r = { 0, 0, bounds_.width(), bounds_.height() };
+  XRectangle r = { 0, 0, static_cast<unsigned short>(bounds_.width()),
+                   static_cast<unsigned short>(bounds_.height()) };
   XShapeCombineRectangles(xdisplay_, xwindow_, ShapeBounding,
                           0, 0, &r, 1, ShapeSet, YXBanded);
 }
 
 std::list<XID>& DesktopRootWindowHostX11::open_windows() {
   if (!open_windows_)
     open_windows_ = new std::list<XID>();
   return *open_windows_;
 }
 
@@ skipping 330 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views