Merge to XFA: CJS_Timer should observe CJS_Runtime destruction.

Also remove dead CJS_EmbedObj::{Begin,End}Timer code.

BUG=539107
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1384883002 .

(cherry picked from commit 794c9b67d3d519342aa7e15052766f7d4a99f551)

Review URL: https://codereview.chromium.org/1386053002 .
5 files changed