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

chrome/browser/ui/views/bar_control_button.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 "chrome/browser/ui/views/bar_control_button.h"
 
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 #include "ui/views/animation/button_ink_drop_delegate.h"
@@ skipping 30 matching lines @@
   if (!border()) {
     SetBorder(views::Border::CreateEmptyBorder(
         kButtonExtraTouchSize, kButtonExtraTouchSize, kButtonExtraTouchSize,
         kButtonExtraTouchSize));
   }
 }
 
 void BarControlButton::OnThemeChanged() {
   SkColor icon_color =
       color_utils::DeriveDefaultIconColor(get_text_color_callback_.Run());
-  gfx::ImageSkia image = gfx::CreateVectorIcon(id_, 16, icon_color);
+  gfx::ImageSkia image = gfx::CreateVectorIcon(id_, icon_color);
   SetImage(views::CustomButton::STATE_NORMAL, &image);
-  image = gfx::CreateVectorIcon(id_, 16, SkColorSetA(icon_color, 0xff / 2));
+  image = gfx::CreateVectorIcon(id_, SkColorSetA(icon_color, 0xff / 2));
   SetImage(views::CustomButton::STATE_DISABLED, &image);
   set_ink_drop_base_color(icon_color);
 }
 
 void BarControlButton::OnNativeThemeChanged(const ui::NativeTheme* theme) {
   OnThemeChanged();
 }