Merge to XFA: Kill JS_TIMER_MAPARRAY

(cherry picked from commit 2a0a26c94ef8131ee29ac4d466c42593cf2ff005)
Review URL: https://codereview.chromium.org/1286383004 .

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

Review URL: https://codereview.chromium.org/1296493003 .
2 files changed