core/play-guice/src/main/java/play/inject/guice/GuiceApplicationBuilder.java
protected GuiceApplicationBuilder newBuilder(
      play.api.inject.guice.GuiceApplicationBuilder builder) {
    return new GuiceApplicationBuilder(builder);
  }
protected GuiceApplicationBuilder newBuilder(
      play.api.inject.guice.GuiceApplicationBuilder builder) {
    return new GuiceApplicationBuilder(builder);
  }
Implementation of Self creation for GuiceBuilder.

@return the application builder