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

third_party/protobuf/java/core/src/main/java/com/google/protobuf/RpcUtil.java

Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/RpcUtil.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/RpcUtil.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/RpcUtil.java
similarity index 98%
rename from third_party/protobuf/java/src/main/java/com/google/protobuf/RpcUtil.java
rename to third_party/protobuf/java/core/src/main/java/com/google/protobuf/RpcUtil.java
index 694b8d132b4c60c275c32051d77a23e9510d1ef1..f7d555ae155f51e55d54610f6251e743163dc18d 100644
--- a/third_party/protobuf/java/src/main/java/com/google/protobuf/RpcUtil.java
+++ b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/RpcUtil.java
@@ -71,6 +71,7 @@ public final class RpcUtil {
       final Class<Type> originalClass,
       final Type defaultInstance) {
     return new RpcCallback<Message>() {
+      @Override
       public void run(final Message parameter) {
         Type typedParameter;
         try {
@@ -107,8 +108,9 @@ public final class RpcUtil {
     return new RpcCallback<ParameterType>() {
       private boolean alreadyCalled = false;
 
+      @Override
       public void run(final ParameterType parameter) {
-        synchronized(this) {
+        synchronized (this) {
           if (alreadyCalled) {
             throw new AlreadyCalledException();
           }