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Windows 7 no longer works for building Chromium and nobody has
volunteered to add support and Windows 7 is an unsupported OS so this
change formalizes that Windows 10 is now required in order to build
Chromium. This updates the documentation and modifies one of the build
scripts so that a readable error message will be displayed when building
on Windows 7 is attempted.

Chromium and its derivatives still run on Windows 7. This only affects
developers.

Bug: 1150302
Change-Id: I1874c691a1405482232323bef025aba4b3ac74b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570075Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833327}