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The |defined(ARCH_CPU_64_BITS)| check is a remnant of the
CheckedPtr2/MTECheckedPtr era, which worked only with 64-bit pointers.
BackupRefPtr doesn't have this limitation.

Bug: 1073933
Change-Id: I8e3dc79291b6bd2b118cb34b0b564f58e4ccc785
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2571143
Auto-Submit: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837917}