Clamp scroll offset to min/max in PopupListBox::updateScrollbars.

Source/web/PopupListBox.h

 /*
  * Copyright (c) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 225 matching lines @@
     // Returns the font to use for the given row
     Font getRowFont(int index) const;
 
     // Moves the selection down/up one item, taking care of looping back to the
     // first/last element if m_loopSelectionNavigation is true.
     void selectPreviousRow();
     void selectNextRow();
 
     int scrollX() const { return scrollPosition().x(); }
     int scrollY() const { return scrollPosition().y(); }
-    void updateScrollbars(const IntPoint& desiredOffset);
+    void updateScrollbars(IntPoint desiredOffset);
     void setHasVerticalScrollbar(bool);
     Scrollbar* scrollbarAtWindowPoint(const IntPoint& windowPoint);
     IntRect contentsToWindow(const IntRect&) const;
     void setContentsSize(const IntSize&);
     void adjustScrollbarExistence();
     void updateScrollbarGeometry();
     IntRect windowClipRect() const;
 
     // If the device is a touch screen we increase the height of menu items
     // to make it easier to unambiguously touch them.
@@ skipping 59 matching lines @@
     RawPtrWillBeMember<PopupContainer> m_container;
 
     RefPtrWillBeMember<Scrollbar> m_verticalScrollbar;
     IntSize m_contentsSize;
     IntPoint m_scrollOffset;
 };
 
 } // namespace blink
 
 #endif