Replace deprecated JsonObject.readFrom() with Json.parse().asObject

Change-Id: I9e6e5a83edfd2c6abc694c1cc1e939b0b826e980
diff --git a/web/api/src/test/java/org/onosproject/rest/StatisticsResourceTest.java b/web/api/src/test/java/org/onosproject/rest/StatisticsResourceTest.java
index af64224..65ebd7d 100644
--- a/web/api/src/test/java/org/onosproject/rest/StatisticsResourceTest.java
+++ b/web/api/src/test/java/org/onosproject/rest/StatisticsResourceTest.java
@@ -18,6 +18,7 @@
 import java.util.HashMap;
 import java.util.stream.IntStream;
 
+import com.eclipsesource.json.Json;
 import org.junit.Before;
 import org.junit.Test;
 import org.onlab.osgi.ServiceDirectory;
@@ -126,7 +127,7 @@
                 .queryParam("port", "2")
                 .get(String.class);
 
-        final JsonObject result = JsonObject.readFrom(response);
+        final JsonObject result = Json.parse(response).asObject();
         assertThat(result, notNullValue());
 
         assertThat(result.names(), hasSize(1));
@@ -148,7 +149,7 @@
         final WebResource rs = resource();
         final String response = rs.path("statistics/flows/link/").get(String.class);
 
-        final JsonObject result = JsonObject.readFrom(response);
+        final JsonObject result = Json.parse(response).asObject();
         assertThat(result, notNullValue());
 
         assertThat(result.names(), hasSize(1));