fix: add missing import and fix formatting

Author: blakeli0

gax-java/gax-httpjson/src/main/java/com/google/api/gax/httpjson/HttpJsonCallableFactory.java

@@ -45,6 +45,7 @@
 import com.google.api.gax.rpc.UnaryCallSettings;
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.api.gax.tracing.ApiTracerContext;
+import com.google.api.gax.tracing.SpanName;
 import com.google.api.gax.tracing.TracedUnaryCallable;
 import javax.annotation.Nonnull;
 

gax-java/gax/src/main/java/com/google/api/gax/tracing/ApiTracerContext.java

@@ -172,7 +172,6 @@ String rpcSystemName() {
   @Nullable
   public abstract String destinationResourceName();
 
-
   /**
    * @return a map of attributes to be included in attempt-level spans
    */
@@ -328,7 +327,6 @@ public abstract static class Builder {
 
     public abstract Builder setDestinationResourceName(@Nullable String destinationResourceName);
 
-
     public abstract ApiTracerContext build();
   }
 }