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This reverts commit e7a24ceb.

Reason for revert:  Suspected cause of Use-after-poison in blink::ThreadableLoader::Cancel

Original change's description:
> Move content::ManifestFetcher in blink
> 
> This is a part of moving manifest implementation to blink.
> This CL moves content::ManifestFetcher to blink and introduces
> WebManifestFetcher in blink/public/web to expose the fetcher to
> content::ManifestManager.
> 
> Bug: 704441
> Change-Id: Ia4114390f124973542aca0151d06baec82fdaec1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1548972
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
> Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#649147}

TBR=dgozman@chromium.org,yhirano@chromium.org,haraken@chromium.org,dominickn@chromium.org,myid.shin@igalia.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 704441
Change-Id: I719bf26205f0aa1377ad5ab320fcd23f3e187ac6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562572Reviewed-by: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#649688}