Fix compilation of Uniscribe code path

Even though the Uniscribe code path is no longer used in tip of tree it
is still used by the current stable version of chrome. Until no
shipping version uses it it should still be maintained.

Fix a couple of compilation errors due to recent refactorings.

R=dglazkov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/134503002

git-svn-id: svn://svn.chromium.org/blink/trunk@164899 bbb929c8-8fbe-4397-9dbb-9b2b20218538