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ABSL is trying to be -Wundef clean and sending a patch for these
macros seems overkill. They are used inside a __APPLE__ block with
this pattern:

#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
#endif

Bug: None
Change-Id: I863d099dcc3a2588388afab24a61be89884b392b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612913Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660995}