[Merge] lp:~seb128/indicator-messages/symbolic-icons-tests into lp:indicator-messages

[Marco Trevisan (Treviño)]

Review: Approve

Need to go back with this, apparently.

Already building at https://bileto.ubuntu.com/#/ticket/3420
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https://code.launchpad.net/~seb128/indicator-messages/symbolic-icons-tests/+merge/355144
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