<Swing Dev> [12] RFR JDK-8213181:Updation of ProblemList.txt for removal of passing swing test

[Sergey Bylokhov]

> In light of above comments, I think we can safely remove these below 4 tests from problemlist> javax/swing/JButton/8151303/PressedIconTest.java> javax/swing/JWindow/ShapedAndTranslucentWindows/ShapedPerPixelTranslucentGradient.java> javax/swing/JComboBox/6607130/bug6607130.java
> javax/swing/plaf/basic/BasicTextUI/8001470/bug8001470.java

ok.

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Best regards, Sergey.