[9] Review Request: 8067087 Fix mac-specific deprecation warnings in the java.desktop module

[Sergey Bylokhov]

Hello.
Please review the fix for jdk9.
Most of the warnings in the bug description were related to getPeer(), 
which was removed already. Other cases are fixed except the usage of 
SwingUtilities.findFocusOwner(Component).

Bug: https://bugs.openjdk.java.net/browse/JDK-8067087
Webrev can be found at: http://cr.openjdk.java.net/~serb/8067087/webrev.00

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Best regards, Sergey.