Review Request 35089: Replace lock_guard with synchronized in fetcher_cache_test.

[Joris Van Remoortere]

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https://reviews.apache.org/r/35089/
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Review request for mesos, Benjamin Hindman and Bernd Mathiske.


Bugs: MESOS-2805
    https://issues.apache.org/jira/browse/MESOS-2805


Repository: mesos


Description
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See summary.


Diffs
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  src/tests/fetcher_cache_tests.cpp cbd44b98d19953d174fac977f509d4900a37481f 

Diff: https://reviews.apache.org/r/35089/diff/


Testing
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Thanks,

Joris Van Remoortere