Remove some more !IsModeMaterial code.

chrome/browser/ui/views/dropdown_bar_view.h

-// 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.
-
-#ifndef CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
-#define CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_
-
-#include "base/macros.h"
-#include "chrome/browser/ui/views/dropdown_bar_host.h"
-#include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
-#include "ui/views/accessible_pane_view.h"
-
-namespace gfx {
-class Canvas;
-class ImageSkia;
-}  // namespace gfx
-
-////////////////////////////////////////////////////////////////////////////////
-//
-// The DropdownBarView is an abstract view to draw the UI controls of the
-// DropdownBarHost.
-//
-////////////////////////////////////////////////////////////////////////////////
-class DropdownBarView : public views::AccessiblePaneView,
-                        public DropdownBarHostDelegate {
- public:
-  explicit DropdownBarView(DropdownBarHost* host);
-  ~DropdownBarView() override;
-
- protected:
-  // Returns the DropdownBarHost that manages this view.
-  DropdownBarHost* host() const { return host_; }
-
-  void SetBackground(const gfx::ImageSkia* left_alpha_mask,
-                     const gfx::ImageSkia* right_alpha_mask);
-  void SetBorderFromIds(int left_border_image_id,
-                        int middle_border_image_id,
-                        int right_border_image_id);
-
- private:
-  // The dropdown bar host that controls this view.
-  DropdownBarHost* host_;
-
-  DISALLOW_COPY_AND_ASSIGN(DropdownBarView);
-};
-#endif  // CHROME_BROWSER_UI_VIEWS_DROPDOWN_BAR_VIEW_H_