RFR: 8276863: Remove test/jdk/sun/security/ec/ECDSAJavaVerify.java

[Weijun Wang]

The test was added in JDK-8237218 to confirm that Java impl is used when verifying a signature. It is useless now since the native implementation is completely removed.

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Commit messages:
 - 8276863: Remove test/jdk/sun/security/ec/ECDSAJavaVerify.java

Changes: https://git.openjdk.java.net/jdk/pull/6313/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6313&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276863
  Stats: 247 lines in 1 file changed: 0 ins; 247 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6313.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6313/head:pull/6313

PR: https://git.openjdk.java.net/jdk/pull/6313