MacViews: Don't draw custom frame on Mac

chrome/browser/ui/views/frame/desktop_browser_frame_auralinux.h

+// Copyright 2015 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_FRAME_DESKTOP_BROWSER_FRAME_AURALINUX_H_
+#define CHROME_BROWSER_UI_VIEWS_FRAME_DESKTOP_BROWSER_FRAME_AURALINUX_H_
+
+#include "base/prefs/pref_member.h"
+#include "chrome/browser/ui/views/frame/desktop_browser_frame_aura.h"
+
+// Provides the window frame for the Chrome browser window on Desktop Linux.
+class DesktopBrowserFrameAuraLinux : public DesktopBrowserFrameAura {
+ public:
+  DesktopBrowserFrameAuraLinux(BrowserFrame* browser_frame,
+                               BrowserView* browser_view);
+
+ protected:
+  ~DesktopBrowserFrameAuraLinux() override;
+
+  // Overridden from NativeBrowserFrame:
+  views::Widget::InitParams GetWidgetParams() override;
+  bool UseCustomFrame() const override;
+
+ private:
+  // Called when the preference changes.
+  void OnUseCustomChromeFrameChanged();
+
+  // Whether the custom Chrome frame preference is set.
+  BooleanPrefMember use_custom_frame_pref_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopBrowserFrameAuraLinux);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_FRAME_DESKTOP_BROWSER_FRAME_AURALINUX_H_