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Changes the experimental GPU Windows 10 NVIDIA Quadro P400 builder to
target machines in the chromium.tests.gpu.experimental pool running
Windows 10 1909, which is the version we are planning to upgrade to.

Bug: 1085489, 1106076, 1106078
Change-Id: I92e43bb0baff75e1061e57a0336f3658c769d825
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276658
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789164}