Fix DCHECK() in infobar animation.

chrome/browser/ui/views/infobars/infobar_container_view.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_VIEWS_INFOBARS_INFOBAR_CONTAINER_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_INFOBARS_INFOBAR_CONTAINER_VIEW_H_
 #pragma once
 
 #include "chrome/browser/ui/views/accessible_pane_view.h"
 #include "chrome/browser/ui/views/infobars/infobar_container.h"
 
 // The views-specific implementation of InfoBarContainer.
 class InfoBarContainerView : public AccessiblePaneView,
                              public InfoBarContainer {
  public:
   explicit InfoBarContainerView(Delegate* delegate);
   virtual ~InfoBarContainerView();
 
-  // Overlap the previous view by this amount, vertically, so that the
-  // first InfoBarView in this InfoBarContainer may draw its tab on
-  // top.
-  int VerticalOverlap();
+  virtual int GetVerticalOverlap() OVERRIDE;
 
  private:
   // AccessiblePaneView:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
   // InfobarContainer:
   virtual void PlatformSpecificAddInfoBar(InfoBar* infobar) OVERRIDE;
   virtual void PlatformSpecificRemoveInfoBar(InfoBar* infobar) OVERRIDE;
 
-  // Return the maximum vertical overlap of the InfoBarContainer's children,
-  // and, when |total_height| is non-NULL, set the |*total_height| of the
-  // InfoBarContainer.
+  // Return the amount by which to overlap the toolbar above, and, when
+  // |total_height| is non-NULL, set it to the height of the InfoBarContainer
+  // (including overlap).
   int GetVerticalOverlap(int* total_height);
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarContainerView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_INFOBARS_INFOBAR_CONTAINER_VIEW_H_