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This is a reland of 251a3311, possible now
that the Creators Update SDK (10.0.15036) is now required when building
Chrome.

Original change's description:
> Implemented changes to Sid class for AC support.
> 
> This CL implements changes to the sandbox Sid class to support the creation
> of Capability Sid objects. It also contains a few refactoring efforts to
> cleanup up older code.
> 
> Bug: 760977
> Cq-Include-Trybots: master.tryserver.chromium.win:win10_chromium_x64_rel_ng
> Change-Id: Id9c05b8017abb81896c1bc30f23599441812d1fd
> Reviewed-on: https://chromium-review.googlesource.com/649026
> Commit-Queue: James Forshaw <forshaw@chromium.org>
> Reviewed-by: Will Harris <wfh@chromium.org>
> Reviewed-by: Penny MacNeil <pennymac@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#501229}

Bug: 760977
Change-Id: I4d3f61190f8f34bc638cf2c48646bfc66a6508af
Cq-Include-Trybots: master.tryserver.chromium.win:win10_chromium_x64_rel_ng
Reviewed-on: https://chromium-review.googlesource.com/691114Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505430}