Revert "Disable framebusting intervention for M64."

This reverts commit 45582a715b2d4f41efc510d6196e6a232126f4fc.

Reason for revert: Reneable framebusting on trunk now that this is merged to M64 branch.

Original change's description:
> Disable framebusting intervention for M64.
> 
> Bug: 624061
> Change-Id: I0b863938467b81dae3fbecd17b23aaf6faffe2a7
> Reviewed-on: https://chromium-review.googlesource.com/876508
> Reviewed-by: Ojan Vafai <ojan@chromium.org>
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Commit-Queue: Nate Chapin <japhet@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#530608}

TBR=nasko@chromium.org,ojan@chromium.org,japhet@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 624061
Change-Id: I0d3963d7746944cd37123f9d4d8b88549c12e6c1
Reviewed-on: https://chromium-review.googlesource.com/878924
Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Nate Chapin <japhet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531045}
5 files changed