8151148: [TEST BUG] Fix imports for com.sun.javafx.Utils

[Andrey Rusakov]

Hello, everyone!
I've found that test workspace fixes for JDK-8093068 
<https://bugs.openjdk.java.net/browse/JDK-8093068> were not integrated 
into tests files and that need to be done.
Please look at my small fix: 
http://cr.openjdk.java.net/~arusakov/8151148/webrev.00/ 
<http://cr.openjdk.java.net/%7Earusakov/8151148/webrev.00/> and commit it.
Changeset is also applicable for 9u-dev tests.

<https://bugs.openjdk.java.net/browse/JDK-8093068>