Hello.
Please review the small cleanup for JDK 15.

Bug: https://bugs.openjdk.java.net/browse/JDK-8238276
Fix: http://cr.openjdk.java.net/~serb/8238276/webrev.00

I have found that ComponentPeer.xxxImage methods are not implemented in some 
peers.

For example on macOS the CFileDialog#check/create/prepareImage are noop,
but the same methods are implemented in other toolkits.

When I tried to implement it I realize that all peers on all platforms 
implements
these methods in the same way on top of Toolkit.xxxImage methods.

These peers methods are called from the Component class if the H/W peer exists,
otherwise the toolkit methods are called. Actually this logic is redundant since
at the end we call toolkits methods anyway:
 - directly from the Component
 - indirectly via the peers.

In the fix, I have dropped the peers methods and always use toolkits.


--
Best regards, Sergey.

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