chore(spanner): lint fix

Author: harshachinta

google-cloud-spanner/src/main/java/com/google/cloud/spanner/Mutation.java

@@ -504,9 +504,6 @@ static com.google.spanner.v1.Mutation toProtoGetRandomMutation(
       }
     }
 
-    System.out.println("Printing");
-    System.out.println(allMutationsExcludingInsert);
-    System.out.println(largeInsertMutation);
     // Select a random mutation based on the heuristic.
     if (allMutationsExcludingInsert.size() > 0) {
       int randomIndex = ThreadLocalRandom.current().nextInt(allMutationsExcludingInsert.size());

google-cloud-spanner/src/test/java/com/google/cloud/spanner/MutationTest.java

@@ -493,7 +493,6 @@ public void toProtoCoalescingDeleteChanges() {
 
     List<com.google.spanner.v1.Mutation> proto = new ArrayList<>();
     com.google.spanner.v1.Mutation mutation = Mutation.toProtoGetRandomMutation(mutations, proto);
-    System.out.println(mutation);
     assertTrue(mutation.hasDelete());
 
     assertThat(proto.size()).isEqualTo(4);