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This CL also adds support in BarrierCallback for running done_callbacks that take a `const std::vector<T>&` of results, rather than a std::vector<T>; and also adds support for use with RepeatingCallbacks whose parameter T is a const and/or reference. Persistent Quota I2D: https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/ziTjKMdOqz8 Bug: 1233525 Change-Id: I005b5b9329692f13a7b16f9bdb8e4be462c6fcc4 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3052556 Commit-Queue: Chris Fredrickson <cfredric@chromium.org> Reviewed-by: Marijn Kruisselbrink <mek@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Cr-Commit-Position: refs/heads/master@{#913064}