RTL HTML/CSS clean-up with -webkit-foo-{start,end}...

RTL HTML/CSS clean-up with -webkit-foo-{start,end}

With -webkit-{margin,padding}-{start,end}, a lot of dir=rtl pseudo-selectors
can be removed. 

While I'm at it, I fixed one glitch in the history page where 'text-align: right' is hard-coded instead of 'text-align: end'

BUG=NONE
TEST=extension/download/plugin/history and DOM UI pages are laid out as before both in LTR CHrome and RTL Chrome.



Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=68364

[arv (Not doing code reviews), 2010-11-22 19:18:33]

LGTM