Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java

Index: third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java
diff --git a/third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java b/third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java
index a312fc33af09d9e169b356b058cfbe85f0fa5b20..194f7b9c737b85e21030a2a7884ba7c0941668b0 100644
--- a/third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java
+++ b/third_party/protobuf/java/util/src/test/java/com/google/protobuf/util/FieldMaskUtilTest.java
@@ -152,6 +152,15 @@ public class FieldMaskUtilTest extends TestCase {
     FieldMask result = FieldMaskUtil.union(mask1, mask2);
     assertEquals("bar,foo", FieldMaskUtil.toString(result));
   }
+
+  public void testUnion_usingVarArgs() throws Exception {
+    FieldMask mask1 = FieldMaskUtil.fromString("foo");
+    FieldMask mask2 = FieldMaskUtil.fromString("foo.bar,bar.quz");
+    FieldMask mask3 = FieldMaskUtil.fromString("bar.quz");
+    FieldMask mask4 = FieldMaskUtil.fromString("bar");
+    FieldMask result = FieldMaskUtil.union(mask1, mask2, mask3, mask4);
+    assertEquals("bar,foo", FieldMaskUtil.toString(result));
+  }
   
   public void testIntersection() throws Exception {
     // Only test a simple case here and expect