Changes to the Object prototype may cause getIgnitionDispatchCounters()
to fail when building the counters table object. Using DefineOwnProperty
instead of Set solves the issue by ignoring the prototype chain.

BUG=chromium:613567
LOG=N

Review-Url: https://codereview.chromium.org/2000203002
Cr-Commit-Position: refs/heads/master@{#36447}