Fix a bug of PopupAlignmentDelegate on non-primary display

ui/message_center/views/desktop_popup_alignment_delegate.h

 // Copyright 2014 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 UI_MESSAGE_CENTER_VIEWS_DESKTOP_POPUP_ALIGNMENT_DELEGATE_H_
 #define UI_MESSAGE_CENTER_VIEWS_DESKTOP_POPUP_ALIGNMENT_DELEGATE_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 16 matching lines @@
       public display::DisplayObserver {
  public:
   DesktopPopupAlignmentDelegate();
   ~DesktopPopupAlignmentDelegate() override;
 
   void StartObserving(display::Screen* screen);
 
   // Overridden from PopupAlignmentDelegate:
   int GetToastOriginX(const gfx::Rect& toast_bounds) const override;
   int GetBaseLine() const override;
-  int GetWorkAreaBottom() const override;
+  gfx::Rect GetWorkArea() const override;
   bool IsTopDown() const override;
   bool IsFromLeft() const override;
   void RecomputeAlignment(const display::Display& display) override;
   void ConfigureWidgetInitParamsForContainer(
       views::Widget* widget,
       views::Widget::InitParams* init_params) override;
 
  private:
   friend class test::MessagePopupCollectionTest;
 
@@ skipping 16 matching lines @@
   int64_t primary_display_id_;
   display::Screen* screen_;
   gfx::Rect work_area_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopPopupAlignmentDelegate);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_DESKTOP_POPUP_ALIGNMENT_DELEGATE_H_