Revert "Google Credential Provider for Windows."

This reverts commit bdb69cb26acca5935e3d0e9061b4772014b2b612.

Reason for revert: Failing checkbins on https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/win-rel/3814

Original change's description:
> Google Credential Provider for Windows.
> 
> Initial commit of COM object implementation.
> 
> Bug: 789588
> Change-Id: I2926f9a46f898c236251131e7e2b215e2bdb967a
> Reviewed-on: https://chromium-review.googlesource.com/c/1190583
> Commit-Queue: Roger Tawa <rogerta@chromium.org>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Reviewed-by: François Doray <fdoray@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Reviewed-by: Greg Thompson <grt@chromium.org>
> Reviewed-by: Owen Min <zmin@chromium.org>
> Reviewed-by: Marc-André Decoste <mad@chromium.org>
> Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596836}

TBR=rogerta@chromium.org,pastarmovj@chromium.org,mad@chromium.org,thakis@chromium.org,fdoray@chromium.org,zmin@chromium.org,jochen@chromium.org,grt@chromium.org

Change-Id: Ia05d3d5a987d780da8c2f0f922becf67a145cc14
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 789588
Reviewed-on: https://chromium-review.googlesource.com/c/1263048
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596866}