Review Request 43658: Modified the received callback argument to be ref.

[Anand Mazumdar]

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Review request for mesos and Vinod Kone.


Bugs: MESOS-3570
    https://issues.apache.org/jira/browse/MESOS-3570


Repository: mesos


Description
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See summary.


Diffs
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  src/scheduler/scheduler.cpp 99a7d0dfff7b0c61decc9ff6d9e6d46ef13a7e75 

Diff: https://reviews.apache.org/r/43658/diff/


Testing
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make check


Thanks,

Anand Mazumdar