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This reverts commit e82de9ba.

Reason for revert: crbug.com/1000677

Original change's description:
> Add browser test for TrustableBundledExchangesFile
> 
> Bug: 966753
> Change-Id: If6a23e14c62f5ac1639a7eb9096314c13104f9b8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784259
> Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
> Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#693091}

TBR=horo@chromium.org,ksakamoto@chromium.org

Change-Id: Iddbd2794d3bd7d98e76b28c9ac0a7f9b6a62f609
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 966753
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783644Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693189}