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Merge the malloc/PartitionAlloc field trial to reflect a similar merging
upstream into a single experiment. This makes it easier to measure the
combined memory/perf regression of GWP-ASan for malloc and
PartitionAlloc and eliminates platform-specific field trials.

Change-Id: I89eebfb75366bdef5b8775d0135f9875fdc62438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719990
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681474}