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This aligns the chromium.clang waterfall swarming configuration with the
configuration used for chromium.win.

Use the 'win10' mixin as a shorter spelling for:
'swarming': { 'dimension_sets': { 'os': 'Windows-10-1503' } } }
... and use that on the CrWinASan bots, which are also all x64 bots.

R=hans@chromium.org, thakis@chromium.org
NOTRY=true

Bug: 939003
Change-Id: I52d33f47b37c0973336695269a499ca9ad2373c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505894
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638733}