base/allocator: Remove an unused feature, NoPartitionAllocDecommit.

This is only used in an experiment which is over, remove the feature.  As the
feature is disabled by default and no longer enabled by any experiment, this is
not a behavior change.

Bug: 942512
Change-Id: Ia788fabf1d3e129dcf85352a5731c6dc3afb4798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715496
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680794}
2 files changed