Remove ink drop highlight for Ash MD SystemMenuButton

ash/common/system/tray/system_menu_button.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 "ash/common/system/tray/system_menu_button.h"
 
 #include "ash/common/ash_constants.h"
 #include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 20 matching lines @@
   SetTooltipText(l10n_util::GetStringUTF16(accessible_name_id));
 
   // TODO(tdanderson): Update the focus rect color, border thickness, and
   // location for material design.
   SetFocusForPlatform();
   SetFocusPainter(views::Painter::CreateSolidFocusPainter(
       kFocusBorderColor, gfx::Insets(1, 1, 1, 1)));
 
   SetInkDropMode(InkDropMode::ON_NO_GESTURE_HANDLER);
   set_has_ink_drop_action_on_click(true);
-  set_ink_drop_base_color(kMenuIconColor);
+  set_ink_drop_base_color(SK_ColorBLACK);
 }
 
 SystemMenuButton::~SystemMenuButton() {}
 
 std::unique_ptr<views::InkDropRipple> SystemMenuButton::CreateInkDropRipple()
     const {
   return base::MakeUnique<views::FloodFillInkDropRipple>(
       GetLocalBounds(), GetInkDropCenterBasedOnLastEvent(),
       GetInkDropBaseColor(), ink_drop_visible_opacity());
 }
 
 std::unique_ptr<views::InkDropHighlight>
 SystemMenuButton::CreateInkDropHighlight() const {
-  gfx::Size size = GetLocalBounds().size();
-  return base::MakeUnique<views::InkDropHighlight>(
-      size, kInkDropSmallCornerRadius,
-      gfx::RectF(gfx::SizeF(size)).CenterPoint(), kMenuIconColor);
+  return nullptr;
 }
 
 bool SystemMenuButton::ShouldShowInkDropForFocus() const {
   return false;
 }
 
 }  // namespace ash