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service worker: Use Mojo blobs in browser test.

This allows more tests to pass when ServiceWorkerOnUI is enabled,
since ChromeBlobStorageContext can be used only on the IO thread.

Bug: 824858
Change-Id: I7830861183d9d18db3c2ab9fbd6a6c12b3a8a18e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760844Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688437}