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

chrome/browser/ui/views/toolbar/toolbar_view.cc

 // Copyright 2013 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/toolbar/toolbar_view.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 716 matching lines @@
           gfx::Size(0, normal_background->height() - content_shadow_height()));
     }
   }
   return size;
 }
 
 void ToolbarView::LoadImages() {
   const ui::ThemeProvider* tp = GetThemeProvider();
 
   if (ui::MaterialDesignController::IsModeMaterial()) {
-    const int kButtonSize = 16;
     const SkColor normal_color =
         tp->GetColor(ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON);
     const SkColor disabled_color =
         tp->GetColor(ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON_INACTIVE);
 
     back_->SetImage(views::Button::STATE_NORMAL,
                     gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_BACK,
-                                          kButtonSize, normal_color));
+                                          normal_color));
     back_->SetImage(views::Button::STATE_DISABLED,
                     gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_BACK,
-                                          kButtonSize, disabled_color));
+                                          disabled_color));
     forward_->SetImage(
         views::Button::STATE_NORMAL,
-        gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_FORWARD, kButtonSize,
+        gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_FORWARD,
                               normal_color));
     forward_->SetImage(
         views::Button::STATE_DISABLED,
-        gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_FORWARD, kButtonSize,
+        gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_FORWARD,
                               disabled_color));
     home_->SetImage(views::Button::STATE_NORMAL,
                     gfx::CreateVectorIcon(gfx::VectorIconId::NAVIGATE_HOME,
-                                          kButtonSize, normal_color));
+                                          normal_color));
     app_menu_button_->UpdateIcon();
 
     back_->set_ink_drop_base_color(normal_color);
     forward_->set_ink_drop_base_color(normal_color);
     home_->set_ink_drop_base_color(normal_color);
     app_menu_button_->set_ink_drop_base_color(normal_color);
   } else {
     back_->SetImage(views::Button::STATE_NORMAL,
                     *(tp->GetImageSkiaNamed(IDR_BACK)));
     back_->SetImage(views::Button::STATE_DISABLED,
@@ skipping 28 matching lines @@
   SchedulePaint();
 }
 
 int ToolbarView::content_shadow_height() const {
 #if defined(USE_ASH)
   return GetLayoutConstant(TOOLBAR_CONTENT_SHADOW_HEIGHT_ASH);
 #else
   return GetLayoutConstant(TOOLBAR_CONTENT_SHADOW_HEIGHT);
 #endif
 }