Update //third_party/protobuf to version 3.

third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto

Index: third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_mset.proto b/third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto
similarity index 56%
copy from third_party/protobuf/src/google/protobuf/unittest_mset.proto
copy to third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto
index 3497f09fa6d41b7b38357e7f2610dfb5c087d3e4..a9be5166d09f795325eb56b73e28de655bcbf15f 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_mset.proto
+++ b/third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_test.proto
@@ -1,6 +1,6 @@
 // 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
@@ -28,45 +28,47 @@
 // (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 = "proto2";
 
-package protobuf_unittest;
+package map_for_proto2_test;
 
-option optimize_for = SPEED;
+option java_package = "map_test";
+option java_outer_classname = "MapForProto2TestProto";
+option java_generate_equals_and_hash = true;
 
-// A message with message_set_wire_format.
-message TestMessageSet {
-  option message_set_wire_format = true;
-  extensions 4 to max;
-}
+message TestMap {
+  message MessageValue {
+    optional int32 value = 1;
+  }
+  enum EnumValue {
+    FOO = 0;
+    BAR = 1;
+    BAZ = 2;
+    QUX = 3;
+  }
 
-message TestMessageSetContainer {
-  optional TestMessageSet message_set = 1;
-}
+  map<int32, int32>         int32_to_int32_field = 1;
+  map<int32, string>        int32_to_string_field = 2;
+  map<int32, bytes>         int32_to_bytes_field = 3;
+  map<int32, EnumValue>     int32_to_enum_field = 4;
+  map<int32, MessageValue>  int32_to_message_field = 5;
+  map<string, int32>        string_to_int32_field = 6;
 
-message TestMessageSetExtension1 {
-  extend TestMessageSet {
-    optional TestMessageSetExtension1 message_set_extension = 1545008;
+  message MessageWithRequiredFields {
+    required int32 value = 1;
   }
-  optional int32 i = 15;
+  map<int32, MessageWithRequiredFields> required_message_map = 11;
 }
 
-message TestMessageSetExtension2 {
-  extend TestMessageSet {
-    optional TestMessageSetExtension2 message_set_extension = 1547769;
-  }
-  optional string str = 25;
+message TestUnknownEnumValue {
+  // Wire-compatible with TestMap.int32_to_enum_field so we can test the
+  // parsing behavior of TestMap regarding unknown enum values.
+  map<int32, int32> int32_to_int32_field = 4;
 }
 
-// MessageSet wire format is equivalent to this.
-message RawMessageSet {
-  repeated group Item = 1 {
-    required int32 type_id = 2;
-    required bytes message = 3;
-  }
+// Test that the maps initialization code works correctly when the map field
+// references the containing message.
+message TestRecursiveMap {
+  optional int32 value = 1;
+  map<int32, TestRecursiveMap> recursive_map_field = 2;
 }
-