Revert of Subpixel precision for clientWidth, offsetWidth, scrollTop et al (https://codereview.chromium.org/225263021/)

Reason for revert:
Speculative revert. I think this may have caused browser_tests
PrintWebViewHelperTest.AllowUserOriginatedPrinting to fail:
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests&group=%40ToT%20Blink&tests=PrintWebViewHelperTest.AllowUserOriginatedPrinting

Original issue's description:
> Subpixel precision for clientWidth, offsetWidth, scrollTop et al
> 
> Change clientHeight, clientWidth, clientLeft, clientTop, scrollTop,
> scrollLeft, scrollWidth, scrollHeight, offsetWidth, offsetHeight,
> offsetTop, and offsetLeft to return precise floating point values
> instead of rounded int values.
> 
> This matches the latest draft of the CSS OM Specification [1] and the
> opt-in IE10 behavior [2].
> 
> Feature dashboard entry:
>   http://www.chromestatus.com/features/5497402177880064
> 
> Intent to Implement & Ship:
>   https://groups.google.com/a/chromium.org/d/msg/blink-dev/_Q7A4AQBFKY/S4ahQ5iE28QJ
> 
> R=ch.dumez@samsung.com, esprehn@chromium.org, leviw@chromium.org
> BUG=360889
> TEST=fast/sub-pixel/cssom-subpixel-precision.html,
>      fast/sub-pixel/scroll-offset-precision.html
> 
> 1: http://www.w3.org/TR/cssom-view/
> 2: http://blogs.msdn.com/b/ie/archive/2012/02/17/sub-pixel-rendering-and-the-css-object-model.aspx
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173053

NOTREECHECKS=true
NOTRY=true
BUG=360889
TBR=eae

Review URL: https://codereview.chromium.org/266663006

git-svn-id: svn://svn.chromium.org/blink/trunk@173074 bbb929c8-8fbe-4397-9dbb-9b2b20218538