Merge to XFA: Fix strings, ..., void return types for Consts.h.

(cherry picked from commit f9e40aec10263f9445d69598657f42550294d653)
Orignal Review URL: https://codereview.chromium.org/1342433002 .

R=thestig@chromium.org
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1338003004 .
10 files changed