Merge to XFA: Remove dead code that was reactivated when fixing overrides.

BUG=pdfium:205
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1409743004 .

(cherry picked from commit 9ddafc82bddb984ae46ee0df801ba20b446d5158)

Review URL: https://codereview.chromium.org/1411423002 .
11 files changed