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These started flaking after the patch from this review landed:
https://chromium-review.googlesource.com/c/chromium/src/+/2589117

That patch added an early IsFeatureEnabled check which caused a data
race with the ScopedFeatureList usages in the appcache unit tests.

Avoid this data race by deferring calling GetDefaultStoragePartition
and constructing the WeakPtrFactory for the storage partition until
after the appcache tests have a chance to set the feature list.

Bug: 1162415
Change-Id: If5a708155a7cb35a41433ca4176cd42a05c28844
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612029
Commit-Queue: enne <enne@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840401}