[MD] simplify and unify some ink drop center calculations

chrome/browser/ui/views/toolbar/app_menu_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 "chrome/browser/ui/views/toolbar/app_menu_button.h"
 
 #include "base/location.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 170 matching lines @@
   margin_trailing_ = margin;
 
   UpdateThemedBorder();
 
   const int inset = LabelButton::kFocusRectInset;
   SetFocusPainter(views::Painter::CreateDashedFocusPainterWithInsets(
       gfx::Insets(inset, inset, inset, inset + margin)));
   InvalidateLayout();
 }
 
-gfx::Point AppMenuButton::GetInkDropCenter() const {
-  // ToolbarView extends the bounds of the app button to the right in maximized
-  // mode. So instead of using the center point of local bounds, we use the
-  // center point (adjusted for RTL layouts) of the preferred size, which
-  // doesn't change in maximized mode.
-  const int visible_width = GetPreferredSize().width();
-  return gfx::Point(
-      (GetMirroredXWithWidthInView(0, visible_width) + visible_width) / 2,
-      height() / 2);
-}
-
 const char* AppMenuButton::GetClassName() const {
   return "AppMenuButton";
 }
 
 scoped_ptr<views::LabelButtonBorder> AppMenuButton::CreateDefaultBorder()
     const {
   scoped_ptr<views::LabelButtonBorder> border =
       MenuButton::CreateDefaultBorder();
 
   // Adjust border insets to follow the margin change,
@@ skipping 65 matching lines @@
   views::MenuButton::OnPaint(canvas);
   if (ui::MaterialDesignController::IsModeMaterial())
     return;
   // Use GetPreferredSize() to center the icon inside the visible bounds rather
   // than the whole size() (which may refer to hit test region extended to the
   // end of the toolbar in maximized mode).
   icon_painter_->Paint(canvas, GetThemeProvider(),
                        gfx::Rect(GetPreferredSize()),
                        AppMenuIconPainter::BEZEL_NONE);
 }