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This makes the class simpler to use in the common case.

Bug: 1145565
Change-Id: Ib6aab62eebf4e402e364687d4224d0f8d7077e6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549534Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830231}