Request for approval for bug #8031488

[Iaroslav Savytskyi]

Hello,

I would like to request for approval for this fix. This is simple revert of the changes which caused the issue. I’ve returned back synchronization and removed volatile. So now serialVersionUID is the same as before. 

Bug: 
https://bugs.openjdk.java.net/browse/JDK-8031488

Webrev:
http://cr.openjdk.java.net/~mkos/8027908/webrev.00

Thank you.
—
Best regardsю
Iaroslav