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Switches the implementation of the --webview-force-little-cores switch
from base::SetProcessCpuAffinityMode to
content::EnforceProcessCpuAffinity. The latter periodically verifies
that the affinity setting remains active, to detect when the system
resets the affinity setting, and reapplies it if necessary.

Test: Run system WV shell with the flag & check chrome://histograms
Bug: 1111789
Change-Id: Icf4c360a36b8588086a0beb1caedd0e5869e3b59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2502430Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Laís Minchillo <laisminchillo@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Laís Minchillo <laisminchillo@chromium.org>
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821681}