Fix vertical-align: inherit for <length> and <percentage>

This patch fixes vertical-align: inherit for <length> and <percentage>.
The generated applyInherit function only copies the verticalAlign()
value, but when this is set to LENGTH we actually use the Length from
verticalAlignLength().

Review URL: https://codereview.chromium.org/288983003

git-svn-id: svn://svn.chromium.org/blink/trunk@174577 bbb929c8-8fbe-4397-9dbb-9b2b20218538