RFR: 8255477: Remove unused method URL.set(String protocol, String host, int port, String file, String ref)

[Сергей Цыпанов]

Hello, while working with `java.net.URL` I've found unused package-private method `URL.set(String protocol, String host, int port, String file, String ref)` which can be safely removed from JDK. Testing: tier1, tier2

Could someone crate an issue for tracking of this simple change?

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Commit messages:
 - 8255477: Remove unused method URL.set(String protocol, String host, int port, String file, String ref)

Changes: https://git.openjdk.java.net/jdk/pull/779/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=779&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255477
  Stats: 33 lines in 1 file changed: 0 ins; 33 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/779.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/779/head:pull/779

PR: https://git.openjdk.java.net/jdk/pull/779