RFR: 8278263: Remove redundant synchronized from URLStreamHandler.openConnection methods

[Daniel Fuchs]

On Fri, 12 Nov 2021 19:35:10 GMT, Andrey Turbanov <duke at openjdk.java.net> wrote:

> All this Handler's are stateless and there is nothing to protect via synchronization.

Seems reasonable but I'd prefer if this were being pushed in 19 after RDP1.

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PR: https://git.openjdk.java.net/jdk/pull/6373