RFR: JDK-8152467: remove uses of anachronistic array declarations for method return type

[Evgeny Mandrikov]

Hello!

Please review patch [1] for JDK-8152467 [2]. Also it needs a sponsor since
I have only author status in OpenJDK Census [3].

After this change tier1 tests pass and I don't see other occurrences to
replace in output of
ag "\)\s*\[\s*\]" src


With best regards,
Evgeny Mandrikov

[1] http://cr.openjdk.java.net/~godin/8152467/webrev.00/
[2] https://bugs.openjdk.java.net/browse/JDK-8152467
[3] https://openjdk.java.net/census#godin