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  EXPECT_FALSE(CFRangeToNSRange(CFRangeMake(LONG_MAX, LONG_MAX), &range_out));

is failing with a new clang roll, there may be some existing undefined
behavior due to signed integer overflow.

Bug: 1133974
Change-Id: I5a1de0db2753fcb9f325e0dfaa2c228268417e9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441736
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812707}