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This reverts commit b94164ad.

Reason for revert: Suspected of causing
ExtensionWebRequestApiTest.WebRequestApiDoesNotCrashOnErrorAfterProfileDestroyed
failure in
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win7%20Tests%20%28dbg%29%281%29/71221

Original change's description:
> NetworkService: Fix WebViewTest.ClearDataCache
> 
> This patch does 3 things to fix the test:
> 1. Register listeners before loading the actual guest page. See bug for
>    more background.
> 2. Add |was_fetched_via_cache| to |ResourceResponseInfo|.
> 3. Call |NetworkContext::ClearHttpCache()| in
>    |WebViewGuest::ClearData()| when Network Service was enabled. We
>    cannot use |BrowsingDataRemover| because it doesn't support
>    non-default |StoragePartition|.
> 
> Bug: 878060
> Cq-Include-Trybots: luci.chromium.try:linux_mojo
> Change-Id: I5f0ea8e62ee8f44944428cfb041f9d4e427bd67c
> Reviewed-on: https://chromium-review.googlesource.com/1195596
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Clark DuVall <cduvall@chromium.org>
> Commit-Queue: Chong Zhang <chongz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#587753}

TBR=rockot@chromium.org,tsepez@chromium.org,chongz@chromium.org,cduvall@chromium.org

Change-Id: I0a4f300e25d7fd9160d9a8e9ac02c8c733654818
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 878060
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/1198642Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587892}