Reapply r154731 "Move presentation attribute style code out of Element.cpp", the test was a flake.

git-svn-id: svn://svn.chromium.org/blink/trunk@159935 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Disable WebFrameCSSCallbackTest.CatchesAttributeChange - it is flaky.

BUG=306952

Review URL: https://codereview.chromium.org/28373002

git-svn-id: svn://svn.chromium.org/blink/trunk@159936 bbb929c8-8fbe-4397-9dbb-9b2b20218538