Re-enable WebApkUpdateManagerUnitTests

This CL re-enables
WebApkUpdateManagerTest.testFileDeletedIfStoreWebApkUpdateRequestToFileFails
WebApkUpdateManagerTest.testPendingUpdateFileDeletedAfterUpdateCompletion

The tests started failing as a result of
https://chromium-review.googlesource.com/c/chromium/src/+/1494657

BUG=937109

Change-Id: I7c129cde5d3e57b59be34fc750e5ec45e339c325
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1520208
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662052}
1 file changed