Allow chaining OnceCallback.Then(RepeatingCallback).
Because the input type to OnceCallback::Then() is a templated type as OnceCallback<U>, a RepeatingCallback does not bind and implicitly convert to a OnceCallback. This is because templated pattern matching does not try conversions, so it must match exactly. Add an overload of OnceCallback::Then() to receive a RepeatingCallback and cast it explicitly to a OnceCallback, forwarding it on to the original Then() method. R=dcheng@chromium.org Bug: 1140582 Change-Id: Ib571eb361922588a3f200e6aea5c045aad0f72d7 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510411 Commit-Queue: danakj <danakj@chromium.org> Auto-Submit: danakj <danakj@chromium.org> Reviewed-by:Daniel Cheng <dcheng@chromium.org> Cr-Commit-Position: refs/heads/master@{#822850}
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