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Crashpad began using ScopedClearErrno in
https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2119645
but chromium's ScopedClearErrno was replaced with
ScopedClearLastError. mini_chromium was updated to
mirror chromium's ScopedClearLastError in
https://chromium-review.googlesource.com/c/chromium/mini_chromium/+/2141050

Change-Id: I562e25c4033a3c892a6982e3a827a9ee821d8d68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142144
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758621}