Move some class-scope constants to file-scope in the lone subclass using them.

chrome/browser/ui/views/infobars/confirm_infobar.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 "chrome/browser/ui/views/infobars/confirm_infobar.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/ui/views/elevation_icon_setter.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/button/md_text_button.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/link.h"
+#include "ui/views/layout/layout_constants.h"
+
+namespace {
+
+constexpr int kButtonButtonSpacing = views::kRelatedButtonHSpacing;
+constexpr int kEndOfLabelSpacing = views::kItemLabelSpacing;
+
+}  // namespace
 
 // InfoBarService -------------------------------------------------------------
 
 std::unique_ptr<infobars::InfoBar> InfoBarService::CreateConfirmInfoBar(
     std::unique_ptr<ConfirmInfoBarDelegate> delegate) {
   return base::MakeUnique<ConfirmInfoBar>(std::move(delegate));
 }
 
 
 // ConfirmInfoBar -------------------------------------------------------------
@@ skipping 114 matching lines @@
 }
 
 int ConfirmInfoBar::NonLabelWidth() const {
   int width = (label_->text().empty() || (!ok_button_ && !cancel_button_)) ?
       0 : kEndOfLabelSpacing;
   if (ok_button_)
     width += ok_button_->width() + (cancel_button_ ? kButtonButtonSpacing : 0);
   width += cancel_button_ ? cancel_button_->width() : 0;
   return width + ((link_->text().empty() || !width) ? 0 : kEndOfLabelSpacing);
 }