test: remove test-v8-inspector-json-protocol test

Remove parallel/test-v8-inspector-json-protocol, it duplicates the test
found in inspector/test-inspector.

PR-URL: https://github.com/nodejs/node/pull/9184
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Eugene Ostroukhov <eostroukhov@google.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-v8-inspector-json-protocol.js

@@ -1,22 +0,0 @@
-// Flags: --inspect={PORT}
-'use strict';
-
-const common = require('../common');
-const assert = require('assert');
-const http = require('http');
-
-const options = {
-  path: '/json/protocol',
-  port: common.PORT,
-  host: common.localhostIPv4,
-};
-
-http.get(options, common.mustCall((res) => {
-  let body = '';
-  res.setEncoding('utf8');
-  res.on('data', (data) => body += data);
-  res.on('end', common.mustCall(() => {
-    assert(body.length > 0);
-    assert.deepStrictEqual(JSON.stringify(JSON.parse(body)), body);
-  }));
-}));