Revert 163807 "See also webkit.org/b/113415"

> See also webkit.org/b/113415
> 
> Include the logical bottom margin in the layout overflow rect. In the most common use
> case this ensures we can scroll down to the margin that sits after any element that has it.
> The only cases we need to avoid are where the margin is present but doesn't contribute height.
> These are (1) where the element has a margin quirk (i.e. the margin is
> defined with quirky em values ('__qems')) and so is disregarded in margin collapsing and (2) when
> the element is self-collapsing so the entire element adds no height of its own.
> 
> This fix revealed a separate bug where collapsed margins from the content of a table caption
> were not contributing to the height of the caption and its parent. This is tested in
> fast/forms/form-hides-table.html.
> 
> BUG=320743
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=163733
> 
> Review URL: https://codereview.chromium.org/75593002

TBR=robhogan@gmail.com

Review URL: https://codereview.chromium.org/117563002

git-svn-id: svn://svn.chromium.org/blink/trunk@164030 bbb929c8-8fbe-4397-9dbb-9b2b20218538