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GCC throws an error if noexcept is specified on declaration and
definition. Specifing on declaration is enough.

Bug: 819294
Change-Id: I89f03cf3ee73e63b3f711082315a67f93ccc9dbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059999Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742632}