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1. Remove existing gpu driver bug workaround.
2. Add a finch feature flag to enable this workaround instead.

Bug: 1031383
Change-Id: I0934bd8934bd12b5dfe5cf565b5173b68851a099
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2152893
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766522}