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and generally applying noexcept where it make sense.
https://google.github.io/styleguide/cppguide.html#noexcept

Noexcept until recently didn't work with out of line default declarations.
This CL tests that now it compiles on all platforms by applying noexcept for
a few default move operations.

Since this CL is useful not only to test but to merge too, I suggest we merge it.

Discussion on noexcept:
https://groups.google.com/a/chromium.org/forum/?utm_medium=email&utm_source=footer#!msg/cxx/ze4WJFg7RvU/6wU_9xltBgAJ

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: If65a9da6dc803e4dbd03765656a6f122bcb8210e
Reviewed-on: https://chromium-review.googlesource.com/1046005Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Denis Yaroshevskiy <dyaroshev@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#557813}