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A GCC build regression has happened on DisjointRangeLockManager, as its move
operator and constructor were declared noexcept. This was failing because the
default implementation depended on base::WeakPtr, that did not provide
noexcept declaration for them.

So make base::WeakPtr noexcept.

Bug: 819294
Change-Id: I936784b881c7c1afea136ceedbe9341e76464f95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708141Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: José Dapena Paz <jose.dapena@lge.com>
Cr-Commit-Position: refs/heads/master@{#680341}