Revert of Make cc/paint have concrete types

ash/common/shelf/overflow_button.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 "ash/common/shelf/overflow_button.h"
 
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/shelf_view.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/resources/vector_icons/vector_icons.h"
@@ skipping 82 matching lines @@
 
 std::unique_ptr<views::InkDropMask> OverflowButton::CreateInkDropMask() const {
   gfx::Insets insets = GetLocalBounds().InsetsFrom(CalculateButtonBounds());
   return base::MakeUnique<views::RoundRectInkDropMask>(
       size(), insets, kOverflowButtonCornerRadius);
 }
 
 void OverflowButton::PaintBackground(gfx::Canvas* canvas,
                                      const gfx::Rect& bounds) {
   cc::PaintFlags flags;
-  flags.setAntiAlias(true);
+  flags.setFlags(cc::PaintFlags::kAntiAlias_Flag);
   flags.setColor(background_color_);
   canvas->DrawRoundRect(bounds, kOverflowButtonCornerRadius, flags);
 }
 
 void OverflowButton::PaintForeground(gfx::Canvas* canvas,
                                      const gfx::Rect& bounds) {
   const gfx::ImageSkia* image = nullptr;
 
   switch (wm_shelf_->GetAlignment()) {
     case SHELF_ALIGNMENT_LEFT:
@@ skipping 27 matching lines @@
   // a left-aligned shelf, and to the left edge of a right-aligned shelf.
   const int inset = (GetShelfConstant(SHELF_SIZE) - kOverflowButtonSize) / 2;
   const int x = alignment == SHELF_ALIGNMENT_LEFT
                     ? content_bounds.right() - inset - kOverflowButtonSize
                     : content_bounds.x() + inset;
   return gfx::Rect(x, content_bounds.y() + inset, kOverflowButtonSize,
                    kOverflowButtonSize);
 }
 
 }  // namespace ash