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It was only used by MSVC which we no longer use, and it required
including sal.h (somewhat large) in compiler_specific.h (somewhat
commonly included).

clang-cl now no longer needs to process sal.h, which will help
with build times a tiny bit. We still get the format string
protection through the PRINTF_FORMAT macro.

(WPRINTF_FORMAT on the other hand is a no-op and clang-cl
seems to not check wprintf style format strings. So we do
lose some coverage here for wide strings, but we lost that
when we switched to clang-cl.)

TBR=slangley

Bug: none
Change-Id: Iab02869cb06682500ab31e1810c070708347ad64
Reviewed-on: https://chromium-review.googlesource.com/c/1494679
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636549}