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This enables compiling this code with -Wvla.

safe_browsing::DiskImageTypeSnifferMac::AppleDiskImageTrailerSize was a
non-constexpr function whose implementation was hidden in
disk_image_type_sniffer_mac.cc, preventing its return value, no matter
how constant it actually was, from being used to size arrays statically
at compile time in other translation units, such as
archive_analyzer_results.cc. This changes it to be a constexpr variable,
kAppleDiskImageTrailerSize, which can be used to size arrays statically
at compile time.

Change-Id: I35d4582ce8446c9f90d8a6d8576c9d60115c5de8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363069Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799215}