Revert 176261 "Fix for select PopupMenuList appearance in rtl mo..."

This broke webkit_unit_tests in Android bots:
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/14135


> Fix for select PopupMenuList appearance in rtl mode with overlay-scrollbar enabled.
> 
> The content should take total window width while overlay-scrollbar is enabled. 
> 
> BUG=382900
> 
> Review URL: https://codereview.chromium.org/333633003

TBR=sanjoy.pal@samsung.com

Review URL: https://codereview.chromium.org/338993005

git-svn-id: svn://svn.chromium.org/blink/trunk@176309 bbb929c8-8fbe-4397-9dbb-9b2b20218538