Just set borders once when creating a views::LabelButton

chrome/browser/ui/views/toolbar/wrench_menu.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/wrench_menu.h"
 
 #include <algorithm>
 #include <cmath>
 #include <set>
 
@@ skipping 250 matching lines @@
       : LabelButton(listener, text), in_menu_background_(NULL) {}
   ~InMenuButton() override {}
 
   void Init(InMenuButtonBackground::ButtonType type) {
     SetFocusable(true);
     set_request_focus_on_press(false);
     SetHorizontalAlignment(gfx::ALIGN_CENTER);
 
     in_menu_background_ = new InMenuButtonBackground(type);
     set_background(in_menu_background_);
-
-    OnNativeThemeChanged(NULL);
+    SetBorder(views::Border::CreateEmptyBorder(0, kHorizontalPadding, 0,
+                                               kHorizontalPadding));
   }
 
   void SetOtherButtons(const InMenuButton* left, const InMenuButton* right) {
     in_menu_background_->SetOtherButtons(left, right);
   }
 
   // views::LabelButton
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override {
     const MenuConfig& menu_config = MenuConfig::instance(theme);
-    SetBorder(views::Border::CreateEmptyBorder(
-        0, kHorizontalPadding, 0, kHorizontalPadding));
     SetFontList(menu_config.font_list);
 
     if (theme) {
       SetTextColor(
           views::Button::STATE_DISABLED,
           theme->GetSystemColor(
               ui::NativeTheme::kColorId_DisabledMenuItemForegroundColor));
       SetTextColor(
           views::Button::STATE_HOVERED,
           theme->GetSystemColor(
@@ skipping 957 matching lines @@
                                 0,
                                 BookmarkMenuDelegate::SHOW_PERMANENT_FOLDERS,
                                 BOOKMARK_LAUNCH_LOCATION_WRENCH_MENU);
 }
 
 int WrenchMenu::ModelIndexFromCommandId(int command_id) const {
   CommandIDToEntry::const_iterator ix = command_id_to_entry_.find(command_id);
   DCHECK(ix != command_id_to_entry_.end());
   return ix->second.second;
 }