[java] Converting CustomLocator from abstract class to interface

Author: barancev

java/client/src/org/openqa/selenium/remote/locators/CustomLocator.java

@@ -25,13 +25,13 @@
  * (essentially {@code {"using": "locator-name", "value": "arguments"}})
  * and calls it in the context of the server.
  */
-public abstract class CustomLocator {
+public interface CustomLocator {
 
   /**
    * @return The locator name, which is the value of the {@code using}
    *   property of the JSON payload.
    */
-  public abstract String getLocatorName();
+  String getLocatorName();
 
-  public abstract By createBy(Object usingParameter);
+  By createBy(Object usingParameter);
 }

java/server/src/org/openqa/selenium/grid/node/locators/ById.java

@@ -33,7 +33,7 @@
  */
 
 @AutoService(CustomLocator.class)
-public class ById extends CustomLocator {
+public class ById implements CustomLocator {
   @Override
   public String getLocatorName() {
     return "id";

java/server/src/org/openqa/selenium/grid/node/locators/ByName.java

@@ -29,7 +29,7 @@
  */
 
 @AutoService(CustomLocator.class)
-public class ByName extends CustomLocator {
+public class ByName implements CustomLocator {
   @Override
   public String getLocatorName() {
     return "name";