Review Request 72179: Got rid of passing Shared<> into `Subscribers::Subscriber::send(...)`.

[Andrei Sekretenko]

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Review request for mesos and Benjamin Mahler.


Bugs: MESOS-10057
    https://issues.apache.org/jira/browse/MESOS-10057


Repository: mesos


Description
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Now that operator API events are authorized synchronously,
`Subscribers::Subscriber::send(...)` is no longer deferred,
and copying arguments of `Subscribers::send()` into `Shared`
becomes unnecessary.


Diffs
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  src/master/master.hpp f3239cd2efdad8a3391878c9e62c771673400372 
  src/master/master.cpp 3c621e44f15b820c5e4105da1cc19283323ff177 


Diff: https://reviews.apache.org/r/72179/diff/1/


Testing
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make check


Thanks,

Andrei Sekretenko