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Enable GWP-ASan for malloc and PartitionAlloc by default for Windows and
macOS and delete the former field trial config used to launch GWP-ASan.

Bug: 896019, 912286, 956824
Change-Id: Icd146bc63dd6e50e6c5319905ed2f761ebff1bb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866604
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707356}