For some vector icons, get the size from the vector definition.

ui/views/controls/menu/menu_image_util.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/controls/menu/menu_image_util.h"
 
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 
 namespace views {
 
 gfx::ImageSkia GetMenuCheckImage(SkColor icon_color) {
-  return gfx::CreateVectorIcon(gfx::VectorIconId::MENU_CHECK, kMenuCheckSize,

[Evan Stade, 2016/04/26 16:58:29]

In some places we aren't actually getting rid of a constant because it's still
needed elsewhere. In these cases, we still have the constant expressed multiple
times, and the only difference is that if the constants diverge, the error
behavior will be "icon is wrong size" instead of "icon is scaled imperfectly".

-                               icon_color);
+  return gfx::CreateVectorIcon(gfx::VectorIconId::MENU_CHECK, icon_color);
 }
 
 gfx::ImageSkia GetRadioButtonImage(bool toggled,
                                    bool hovered,
                                    SkColor default_icon_color) {
   gfx::VectorIconId id = toggled ? gfx::VectorIconId::MENU_RADIO_SELECTED
                                  : gfx::VectorIconId::MENU_RADIO_EMPTY;
   SkColor color =
       toggled && !hovered ? gfx::kGoogleBlue500 : default_icon_color;
   return gfx::CreateVectorIcon(id, kMenuCheckSize, color);
 }
 
 gfx::ImageSkia GetSubmenuArrowImage(SkColor icon_color) {
-  return gfx::CreateVectorIcon(gfx::VectorIconId::SUBMENU_ARROW,
-                               kSubmenuArrowSize, icon_color);
+  return gfx::CreateVectorIcon(gfx::VectorIconId::SUBMENU_ARROW, icon_color);
 }
 
 }  // namespace views