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The clang we ship no longer includes the static analyzer, so this flag
hasn't been working for a while. Remove it, and mb stuff for an FYI bot
that uses it.

The plan is to run the static analyzer through clang-tidy instead.

While here, also remove the 'win analyze' bot src bits, since that
bot depends on MSVC which we haven't supported in a while either,
and the little bit of GN code kept alive by it.

Bug: 925145,687243
Change-Id: I042d3cc9f512a024a6eae6a8e7d43aa2f9a74fea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1538987
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644866}