Remove two unused fields found by scythe.
Remove two unused fields found by scythe.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/139003003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@165344 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs