Use character names defined in CharacterNames.h.
This is code-readability patch. No layout tests are needed.

We were using character style Unicode in Blink, changed to
use Unicode present in CharacterNames.h

BUG=
R=eae@chromium.org

Review URL: https://codereview.chromium.org/509373002

git-svn-id: svn://svn.chromium.org/blink/trunk@181170 bbb929c8-8fbe-4397-9dbb-9b2b20218538