Remove unnecessary Border subclasses where we can achieve the same functionality

chrome/browser/ui/views/infobars/infobar_label_button_border.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/infobars/infobar_label_button_border.h"
-
-#include "chrome/browser/defaults.h"
-#include "grit/theme_resources.h"
-#include "ui/views/painter.h"
-
-namespace {
-
-const int kNormalImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_NORMAL);
-const int kHoveredImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_HOVER);
-const int kPressedImageSet[] = IMAGE_GRID(IDR_INFOBARBUTTON_PRESSED);
-
-}  // namespace
-
-InfoBarLabelButtonBorder::InfoBarLabelButtonBorder()
-    : views::LabelButtonBorder(views::Button::STYLE_TEXTBUTTON) {
-  SetPainter(false, views::Button::STATE_NORMAL,
-             views::Painter::CreateImageGridPainter(kNormalImageSet));
-  SetPainter(false, views::Button::STATE_HOVERED,
-             views::Painter::CreateImageGridPainter(kHoveredImageSet));
-  SetPainter(false, views::Button::STATE_PRESSED,
-             views::Painter::CreateImageGridPainter(kPressedImageSet));
-}
-
-InfoBarLabelButtonBorder::~InfoBarLabelButtonBorder() {
-}
-
-gfx::Insets InfoBarLabelButtonBorder::GetInsets() const{
-  gfx::Insets insets = views::LabelButtonBorder::GetInsets();
-  return gfx::Insets(browser_defaults::kInfoBarBorderPaddingVertical,
-                     insets.left(),
-                     browser_defaults::kInfoBarBorderPaddingVertical,
-                     insets.right());
-}