Update //third_party/protobuf to version 3.

third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java

Index: third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
diff --git a/third_party/protobuf/src/google/protobuf/testing/zcgunzip.cc b/third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
similarity index 51%
copy from third_party/protobuf/src/google/protobuf/testing/zcgunzip.cc
copy to third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
index a6197854bdef63dc11bbdf0b3cf1f7884348b0e3..b1678d1b93a0b63d0e9df35adc038c233c4fc10a 100644
--- a/third_party/protobuf/src/google/protobuf/testing/zcgunzip.cc
+++ b/third_party/protobuf/javanano/src/main/java/com/google/protobuf/nano/UnknownFieldData.java
@@ -1,6 +1,6 @@
 // Protocol Buffers - Google's data interchange format
-// Copyright 2009 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// Copyright 2013 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,46 +28,61 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Author: brianolson@google.com (Brian Olson)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-//
-// Test program to verify that GzipInputStream is compatible with command line
-// gunzip or java.util.zip.GzipInputStream
-//
-// Reads gzip stream on standard input and writes decompressed data to standard
-// output.
+package com.google.protobuf.nano;
 
-#include "config.h"
+import java.io.IOException;
+import java.util.Arrays;
 
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <fcntl.h>
+/**
+ * Stores unknown fields. These might be extensions or fields that the generated
+ * API doesn't know about yet.
+ *
+ * @author bduff@google.com (Brian Duff)
+ */
+final class UnknownFieldData {
 
-#include <google/protobuf/io/gzip_stream.h>
-#include <google/protobuf/io/zero_copy_stream_impl.h>
+    final int tag;
+    /**
+     * Important: this should be treated as immutable, even though it's possible
+     * to change the array values.
+     */
+    final byte[] bytes;
 
-using google::protobuf::io::FileInputStream;
-using google::protobuf::io::GzipInputStream;
+    UnknownFieldData(int tag, byte[] bytes) {
+        this.tag = tag;
+        this.bytes = bytes;
+    }
 
-int main(int argc, const char** argv) {
-  FileInputStream fin(STDIN_FILENO);
-  GzipInputStream in(&fin);
+    int computeSerializedSize() {
+        int size = 0;
+        size += CodedOutputByteBufferNano.computeRawVarint32Size(tag);
+        size += bytes.length;
+        return size;
+    }
 
-  while (true) {
-    const void* inptr;
-    int inlen;
-    bool ok;
-    ok = in.Next(&inptr, &inlen);
-    if (!ok) {
-      break;
+    void writeTo(CodedOutputByteBufferNano output) throws IOException {
+        output.writeRawVarint32(tag);
+        output.writeRawBytes(bytes);
     }
-    if (inlen > 0) {
-      int err = write(STDOUT_FILENO, inptr, inlen);
-      assert(err == inlen);
+
+    @Override
+    public boolean equals(Object o) {
+        if (o == this) {
+            return true;
+        }
+        if (!(o instanceof UnknownFieldData)) {
+            return false;
+        }
+
+        UnknownFieldData other = (UnknownFieldData) o;
+        return tag == other.tag && Arrays.equals(bytes, other.bytes);
     }
-  }
 
-  return 0;
+    @Override
+    public int hashCode() {
+        int result = 17;
+        result = 31 * result + tag;
+        result = 31 * result + Arrays.hashCode(bytes);
+        return result;
+    }
 }