Update //third_party/protobuf to version 3.

third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto

Index: third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_import_lite.proto b/third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto
similarity index 55%
copy from third_party/protobuf/src/google/protobuf/unittest_import_lite.proto
copy to third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_lite_test.proto
index 81b117fe8489ecc4cba5410dbf876b4ca473657b..d5418f28bc069dc0ee21ced4201ec2af4c3a4d5a 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_import_lite.proto
+++ b/third_party/protobuf/java/src/test/java/com/google/protobuf/map_for_proto2_lite_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
@@ -28,24 +28,48 @@
 // (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)
-//
-// This is like unittest_import.proto but with optimize_for = LITE_RUNTIME.
+syntax = "proto2";
 
-package protobuf_unittest_import;
 
-option optimize_for = LITE_RUNTIME;
+option java_outer_classname = "MapForProto2TestProto";
+option java_generate_equals_and_hash = true;
 
-option java_package = "com.google.protobuf";
+message TestMap {
+  message MessageValue {
+    optional int32 value = 1;
+  }
+  enum EnumValue {
+    FOO = 0;
+    BAR = 1;
+    BAZ = 2;
+    QUX = 3;
+  }
 
-import public "google/protobuf/unittest_import_public_lite.proto";
+  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 ImportMessageLite {
-  optional int32 d = 1;
+  message MessageWithRequiredFields {
+    required int32 value = 1;
+  }
+  map<int32, MessageWithRequiredFields> required_message_map = 11;
 }
 
-enum ImportEnumLite {
-  IMPORT_LITE_FOO = 7;
-  IMPORT_LITE_BAR = 8;
-  IMPORT_LITE_BAZ = 9;
+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;
 }
+
+// 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;
+}
+package map_for_proto2_lite_test;
+option java_package = "map_lite_test";
+option optimize_for = LITE_RUNTIME;