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This change introduces the convenience typedefs base::MockOnceCallback,
base::MockRepeatingCallback, base::MockOnceClosure and
base::MockRepeatingClosure to base/test/mock_callback.h

Change-Id: I2db99b32e246b94da85805af666f9de93033ab33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674154Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672571}