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The new (10.0.17763.0) version of d3dcompiler_47.dll contains various
bug fixes which we want to ship. We initially avoided upgrading it with
the rest of the SDK because it depends on the universal Windows 10 CRT
(UCRT) which some Windows 7 machines lack. This caused test failures on
some bots and would cause failures on some customer machines.

This change updates how we package isolates so that they always include
the UCRT, to avoid test failures. It also ships api-ms-win-*.dll and
ucrtbase*.dll in mini_installer.exe so that the UCRT will be shipped to
customers. The size increase to mini_installer.exe for this is about
400,000 bytes.

This change also deletes an unused function (_read_configuration_from_gn)
from create_installer_archive.py that sent me down an incorrect path
while investigating fixes.

The toolchain package is the same as the one used when landing
crrev.com/c/1401403 except that the 17763 version of d3dcompiler_47.dll
was retained. See that CL for full instructions on creating the
toolchain package.

Bug: 920704
Change-Id: I9cb7a7ed5cb75d04962fc64869d26b12617c0463
Reviewed-on: https://chromium-review.googlesource.com/c/1450414Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629193}