Clean up redundant Promise.resolve() in Resource
Clean up redundant Promise.resolve() in Resource

Bug: chromium:1161501
Change-Id: I0f2ac7d89c31d673b340e88d96f53e17f08a6f84
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3427058
Reviewed-by: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Commit-Queue: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

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