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This reverts commit 475e9c81.

Reason for revert: Test failed on linux-chromeos-chrome bot

Bug: 1163791

Original change's description:
> Add installability test for when start_url has no offline response
>
> The following case should not pass the offline capability check:
> - manifest's scope: /banners/
> - manifest's start_url: /banners/manifest_test_page.html?ignore
> - service worker's scope: /banners/
>
> Bug: 1157242, 965802
> Change-Id: I2832fbc102fd931aecc9d42394f5429e4c66e6aa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596902
> Commit-Queue: Asami Doi <asamidoi@chromium.org>
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#840905}

TBR=dominickn@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,asamidoi@chromium.org

Change-Id: Ic9ee9b7c0c61ae2c1016e6e2bbad0bfd62bda381
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1157242
Bug: 965802
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612552Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840931}