Enable OomIntervention v2 by default

This CL enables OomIntervention v2 by default with 14% of renderer pmf
threshold.

This is the result of the stable experiment of OomIntervention v2.
https://docs.google.com/document/d/1Yw1lwvHrGtJj0gyCOzttNUayL8ThXsRxDrzZ5g6xE_A/edit?usp=sharing

Bug: 882345
Change-Id: Id209fbe0a291674892c75d0d7d6dd1d1d1ca1706
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1597472
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657124}
2 files changed