Revert 233845 "Use software renderer for windows with an initial..."

Various breakage, see linked bugs.

> Use software renderer for windows with an initial size less than 64x64
> 
> If the width or height of a window is less than 64 pixels then some AMD drivers have problems presenting from them, so composite those windows in software.
> 
> BUG=286609
> 
> Review URL: https://codereview.chromium.org/59913008

BUG=317428,312277

TBR=jbauman@chromium.org

Review URL: https://codereview.chromium.org/69203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234239 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234239