Revert "Remove <video> width and height attributes from intrisic size logic"

This reverts r160491. This is speculative that this patch is causing
the Windows Debug webkit_unit_tests to start failing. It's the only
blink-side patch in the blamelist.

TBR=philipj@opera.com

Review URL: https://codereview.chromium.org/42813003

git-svn-id: svn://svn.chromium.org/blink/trunk@160509 bbb929c8-8fbe-4397-9dbb-9b2b20218538