Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/util/internal/testdata/field_mask.proto

 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google Inc.  All rights reserved.
-// http://code.google.com/p/protobuf/
+// 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
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (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: kenton@google.com (Kenton Varda)
-//  Based on original Protocol Buffers design by
-//  Sanjay Ghemawat, Jeff Dean, and others.
-//
-// This file contains messages for testing message_set_wire_format.
+syntax = "proto3";
 
-package protobuf_unittest;
+package google.protobuf.testing;
 
-option optimize_for = SPEED;
+import "google/protobuf/field_mask.proto";
 
-// A message with message_set_wire_format.
-message TestMessageSet {
-  option message_set_wire_format = true;
-  extensions 4 to max;
+message NestedFieldMask {
+  string data = 1;
+  google.protobuf.FieldMask single_mask = 2;
+  repeated google.protobuf.FieldMask repeated_mask = 3;
 }
 
-message TestMessageSetContainer {
-  optional TestMessageSet message_set = 1;
+message FieldMaskTest {
+  string id = 1;
+  google.protobuf.FieldMask single_mask = 2;
+  repeated google.protobuf.FieldMask repeated_mask = 3;
+  repeated NestedFieldMask nested_mask = 4;
 }
 
-message TestMessageSetExtension1 {
-  extend TestMessageSet {
-    optional TestMessageSetExtension1 message_set_extension = 1545008;
-  }
-  optional int32 i = 15;
+message FieldMaskTestCases {
+  FieldMaskWrapper single_mask = 1;
+  FieldMaskWrapper multiple_mask = 2;
+  FieldMaskWrapper snake_camel = 3;
+  FieldMaskWrapper empty_field = 4;
+  FieldMaskWrapper apiary_format1 = 5;
+  FieldMaskWrapper apiary_format2 = 6;
+  FieldMaskWrapper apiary_format3 = 7;
+  FieldMaskWrapper map_key1 = 8;
+  FieldMaskWrapper map_key2 = 9;
+  FieldMaskWrapper map_key3 = 10;
+  FieldMaskWrapper map_key4 = 11;
+  FieldMaskWrapper map_key5 = 12;
 }
 
-message TestMessageSetExtension2 {
-  extend TestMessageSet {
-    optional TestMessageSetExtension2 message_set_extension = 1547769;
-  }
-  optional string str = 25;
+message FieldMaskWrapper {
+  google.protobuf.FieldMask mask = 1;
 }
 
-// MessageSet wire format is equivalent to this.
-message RawMessageSet {
-  repeated group Item = 1 {
-    required int32 type_id = 2;
-    required bytes message = 3;
-  }
+service FieldMaskTestService {
+  rpc Call(FieldMaskTestCases) returns (FieldMaskTestCases);
 }
-