Update unicode to 6.3.0.

Update unicode to 6.3.0.

The only difference is the "Mongolian Vowel Separator", which is no longer
a White_Space, but became a Boundary_Neutral.

6.1.0: 180E;MONGOLIAN VOWEL SEPARATOR;Zs;0;WS;;;;;N;;;;;
6.3.0: 180E;MONGOLIAN VOWEL SEPARATOR;Cf;0;BN;;;;;N;;;;;

R=mstarzinger@chromium.org

[Michael Starzinger, 2014-02-06 16:23:07]

As discussed offline: It would be nice if we could split the manual from the
automatic changes.