Remove special touch-action hit test mode

Don't try to mimic IE's special hit-testing behavior for touch-action - it probably only adds confusion and is unlikely to cause compat issues in practice.  See http://crbug.com/380203 for details.

Also reduces the hit tests done on touchstart from 2 to 1 for improved performance.

BUG=380203

Review URL: https://codereview.chromium.org/329773002

git-svn-id: svn://svn.chromium.org/blink/trunk@176285 bbb929c8-8fbe-4397-9dbb-9b2b20218538