Reason for the Chrome/Scroll bar issue. Its the SharePoint Search bar.
<asp:ContentPlaceHolder id="PlaceHolderSearchArea" runat="server"> <SharePoint:DelegateControl runat="server" ControlId="SmallSearchInputBox" Version="4"/> </asp:ContentPlaceHolder>
If I put this in the hidden panel in the bottom of my master page the scroll and ribbon issues in Chrome go away. Give it a try and see if its the same for you environment. At this point I cant think of a fix other than not using the search control on sites that have to have Chrome support.