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This reverts commit ff67881b.

Reason for revert: Updated credentials but that uncovered a bug with how we handle responses from the Gerrit API.

Original change's description:
> [WPT Export] Create GitHub PRs from Gerrit CLs
> 
> Bug: 700092
> Change-Id: I7fd398d1e25b77493eef609cbf818747216cd140
> Reviewed-on: https://chromium-review.googlesource.com/479931
> Commit-Queue: Jeff Carpenter <jeffcarp@chromium.org>
> Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#471061}

TBR=qyearsley@chromium.org,jeffcarp@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Bug: 700092

Change-Id: Ieb6f34d9762184033c10d6ba7c3b4e8208a7fe5b
Reviewed-on: https://chromium-review.googlesource.com/503553Reviewed-by: Jeff Carpenter <jeffcarp@chromium.org>
Commit-Queue: Jeff Carpenter <jeffcarp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#471109}