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This reverts commit 0895c797.

Reason for revert: Missed a hardcoded gn location: https://crbug.com/857107.

Original change's description:
> Pull GN via CIPD package
> 
> The gn binary will be downloaded into third_party/gn. This CL rolls
> buildtools forward to a revision where gn is no longer in buildtools.
> 
> Because buildtools has no way to cleanup after itself, add
> build/util/gn_cleanup.py to delete the old binaries so that we don't
> accidentally depend on them.
> 
> Update mb.py to use the new location.
> 
> Update explicit location in ios/web_view/BUILD.gn for the new location.
> 
> Update explicit location in
> tools/traffic_annotation/auditor/traffic_annotation_auditor.cc for the new
> location.
> 
> Update explicit location in tools/licenses.py with for the new location.
> 
> Bug: 855791
> Bug: 794764
> Bug: 856883
> Bug: 856884
> Bug: 856878
> Bug: 856899
> Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
> Change-Id: I92c908faf4f868850eafa1b4adf6e7c33c365116
> Reviewed-on: https://chromium-review.googlesource.com/1112840
> Commit-Queue: Scott Graham <scottmg@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#570792}

TBR=dpranke@chromium.org,scottmg@chromium.org

Change-Id: I89e180710b5ce483106fa3b4ff6e8dec06780c07
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 855791, 794764, 856883, 856884, 856878, 856899
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Reviewed-on: https://chromium-review.googlesource.com/1117219Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570799}