views: remove FocusableRoundedBorderMac

ui/views/controls/focusable_rounded_border_mac.cc

-// Copyright 2016 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 "ui/views/controls/focusable_rounded_border_mac.h"
-
-#include "ui/gfx/canvas.h"
-#include "ui/native_theme/native_theme_mac.h"
-
-namespace {
-
-const int kThickness = 1;
-
-}  // namespace
-
-namespace views {
-
-FocusableRoundedBorder::FocusableRoundedBorder() {
-  // TODO(ellyjones): These insets seem like they shouldn't be big enough, but
-  // they are, and insetting by corner_radius_ instead produces gargantuan
-  // padding. Why is that?
-  SetInsets(kThickness, kThickness, kThickness, kThickness);
-}
-
-FocusableRoundedBorder::~FocusableRoundedBorder() {}
-
-// For now, this is similar to RoundedRectBorder::Paint(), but this method will
-// likely diverge in future.
-// TODO(ellyjones): Diverge it by adding soft focus rings.
-void FocusableRoundedBorder::Paint(const View& view, gfx::Canvas* canvas) {
-  cc::PaintFlags flags;
-  flags.setStyle(cc::PaintFlags::kStroke_Style);
-  flags.setStrokeWidth(kThickness);
-  flags.setColor(GetCurrentColor(view));
-  flags.setAntiAlias(true);
-
-  float half_thickness = kThickness / 2.0f;
-  gfx::RectF bounds(view.GetLocalBounds());
-  bounds.Inset(half_thickness, half_thickness);
-  canvas->DrawRoundRect(bounds, ui::NativeThemeMac::kButtonCornerRadius, flags);
-}
-
-}  // namespace views