fix

Author: trask

instrumentation/ratpack/ratpack-1.4/testing/src/main/java/io/opentelemetry/instrumentation/ratpack/client/AbstractRatpackHttpClientTest.java

@@ -189,8 +189,4 @@ private static String nettyExpectedClientSpanNameMapper(URI uri, String method)
     }
     return HttpClientTestOptions.DEFAULT_EXPECTED_CLIENT_SPAN_NAME_MAPPER.apply(uri, method);
   }
-
-  private static boolean isWindows() {
-    return System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("win");
-  }
 }