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This reverts commit 0326c088.

Reason for revert: Suspect of causing virtual/outofblink-cors/external/wpt/service-workers/service-worker/fetch-request-fallback.https.html to fail on several Mac and Linux bots.

See for example
https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Mac10.12/builds/7923

Original change's description:
> Plumb extra errors from ResourceRequestCompletionStatus to Blink
> 
> This patch plumbs CORSError and HTTP response headers
> from ResourceRequestCompletinoStatus to Blink's ResourceError.
> 
> Test: ./Tools/Scripts/run-webkit-tests virtual/outofblink-cors
> Bug: 736308
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
> Change-Id: I20e4ec9a2e7ca93ce692a5a8312dadf59eb0f345
> Reviewed-on: https://chromium-review.googlesource.com/749024
> Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
> Reviewed-by: Mike West <mkwst@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#517388}

TBR=kinuko@chromium.org,toyoshim@chromium.org,tyoshino@chromium.org,yhirano@chromium.org,mkwst@chromium.org

Change-Id: Ib973ef76eaab93e4c4dbf9b08712bbd560eac368
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 736308
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/776913Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517426}