Fix minor style errros

Author: mziccard

gcloud-java-core/src/main/java/com/google/cloud/BatchResult.java

@@ -34,7 +34,7 @@ public abstract class BatchResult<T, E extends BaseServiceException> {
   private T result;
   private boolean completed = false;
   private E error;
-  private List<Callback<T, E>> toBeNotified = new LinkedList<>();
+  private final List<Callback<T, E>> toBeNotified = new LinkedList<>();
 
   /**
    * Returns {@code true} if the batch has been completed and the result is available; {@code false}

gcloud-java-dns/src/main/java/com/google/cloud/dns/DnsBatch.java

@@ -42,7 +42,7 @@
  */
 public class DnsBatch {
 
-  private RpcBatch batch;
+  private final RpcBatch batch;
   private final DnsRpc dnsRpc;
   private final DnsOptions options;
 

gcloud-java-dns/src/main/java/com/google/cloud/dns/DnsImpl.java

@@ -113,8 +113,7 @@ public Page<RecordSet> nextPage() {
   static Function<ManagedZone, Zone> zoneFromPb(final DnsOptions options) {
     return new Function<ManagedZone, Zone>() {
       @Override
-      public Zone apply(
-          com.google.api.services.dns.model.ManagedZone zonePb) {
+      public Zone apply(ManagedZone zonePb) {
         return Zone.fromPb(options.service(), zonePb);
       }
     };

gcloud-java-dns/src/main/java/com/google/cloud/dns/spi/DefaultDnsRpc.java

@@ -58,7 +58,7 @@ public class DefaultDnsRpc implements DnsRpc {
 
   private class DefaultRpcBatch implements RpcBatch {
 
-    private BatchRequest batch;
+    private final BatchRequest batch;
 
     private DefaultRpcBatch(BatchRequest batch) {
       this.batch = batch;

gcloud-java-dns/src/test/java/com/google/cloud/dns/DnsBatchResultTest.java

@@ -21,7 +21,6 @@
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
-import com.google.cloud.BaseServiceException;
 import com.google.cloud.BatchResult;
 
 import org.easymock.EasyMock;

gcloud-java-dns/src/test/java/com/google/cloud/dns/DnsBatchTest.java

@@ -101,7 +101,7 @@ public class DnsBatchTest {
   private DnsRpc dnsRpcMock;
   private RpcBatch batchMock;
   private DnsBatch dnsBatch;
-  private Dns dns = EasyMock.createStrictMock(Dns.class);
+  private final Dns dns = EasyMock.createStrictMock(Dns.class);
 
   @Before
   public void setUp() {

gcloud-java-dns/src/test/java/com/google/cloud/dns/testing/LocalDnsHelperTest.java

@@ -2378,12 +2378,11 @@ public void onSuccess(ChangesListResponse response) {
     }, ImmutableMap.of(DnsRpc.Option.PAGE_SIZE, 2));
     final Iterable<Change> descending = RPC.listChangeRequests(ZONE1.getName(),
         ImmutableMap.of(DnsRpc.Option.SORTING_ORDER, "descending")).results();
-    final int size = 4;
     batch.addListChangeRequests(ZONE_NAME1, new SuccessExpectedCallback<ChangesListResponse>() {
       @Override
       public void onSuccess(ChangesListResponse response) {
         List<Change> changes = response.getChanges();
-        for (int i = 0; i < size; i++) {
+        for (int i = 0; i < 4; i++) {
           assertEquals(Iterables.get(descending, i), changes.get(i));
         }
       }
@@ -2392,8 +2391,8 @@ public void onSuccess(ChangesListResponse response) {
       @Override
       public void onSuccess(ChangesListResponse response) {
         List<Change> changes = response.getChanges();
-        for (int i = 0; i < size; i++) {
-          assertEquals(Iterables.get(descending, i), changes.get(size - i - 1));
+        for (int i = 0; i < 4; i++) {
+          assertEquals(Iterables.get(descending, i), changes.get(3 - i));
         }
       }
     }, ImmutableMap.of(DnsRpc.Option.SORTING_ORDER, "ascending"));