Fix my integration goof.

Author: rlubke

src/main/java/com/ning/http/client/providers/grizzly/GrizzlyAsyncHttpProvider.java

@@ -64,6 +64,7 @@
 import org.glassfish.grizzly.attributes.Attribute;
 import org.glassfish.grizzly.attributes.AttributeStorage;
 import org.glassfish.grizzly.filterchain.BaseFilter;
+import org.glassfish.grizzly.filterchain.FilterChain;
 import org.glassfish.grizzly.filterchain.FilterChainBuilder;
 import org.glassfish.grizzly.filterchain.FilterChainContext;
 import org.glassfish.grizzly.filterchain.FilterChainEvent;
@@ -2508,6 +2509,11 @@ public NextAction handleWrite(FilterChainContext ctx) throws IOException {
 
         }
 
+        @Override
+        public void onFilterChainChanged(FilterChain filterChain) {
+            // no-op
+        }
+
 
         // ----------------------------------------------------- Private Methods