Remove unused method in ORCA server interceptor

Author: danielzhaotongliu

xds/src/main/java/io/grpc/xds/orca/OrcaMetricReportingServerInterceptor.java

@@ -34,7 +34,6 @@
 import io.grpc.services.InternalMetricRecorder;
 import io.grpc.services.MetricRecorder;
 import io.grpc.services.MetricReport;
-import javax.annotation.Nullable;
 
 /**
  * A {@link ServerInterceptor} that intercepts a {@link ServerCall} by running server-side RPC
@@ -63,14 +62,6 @@ public final class OrcaMetricReportingServerInterceptor implements ServerInterce
     OrcaMetricReportingServerInterceptor.instance = this;
   }
 
-  /**
-   * Returns the server interceptor if created, otherwise {@code null}.
-   */
-  @Nullable
-  public static OrcaMetricReportingServerInterceptor getInstanceIfCreated() {
-    return instance;
-  }
-
   public static OrcaMetricReportingServerInterceptor getOrCreateInstance(
       MetricRecorder metricRecorder) {
     if (instance == null) {