Update //third_party/protobuf to version 3.

third_party/protobuf/src/google/protobuf/unittest_custom_options.proto

Index: third_party/protobuf/src/google/protobuf/unittest_custom_options.proto
diff --git a/third_party/protobuf/src/google/protobuf/unittest_custom_options.proto b/third_party/protobuf/src/google/protobuf/unittest_custom_options.proto
index e591d29447505da667eac884ea170a726e978a73..4cc0e362c56c74374b4183965ddd69834583f0cc 100644
--- a/third_party/protobuf/src/google/protobuf/unittest_custom_options.proto
+++ b/third_party/protobuf/src/google/protobuf/unittest_custom_options.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
@@ -32,8 +32,9 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 //
-// A proto file used to test the "custom options" feature of proto2.
+// A proto file used to test the "custom options" feature of google.protobuf.
 
+syntax = "proto2";
 
 // Some generic_services option(s) added automatically.
 // See:  http://go/proto2-generic-services-default
@@ -218,6 +219,7 @@ message ComplexOptionType1 {
   optional int32 foo = 1;
   optional int32 foo2 = 2;
   optional int32 foo3 = 3;
+  repeated int32 foo4 = 4;
 
   extensions 100 to max;
 }
@@ -235,6 +237,7 @@ message ComplexOptionType2 {
   }
 
   optional ComplexOptionType4 fred = 3;
+  repeated ComplexOptionType4 barney = 4;
 
   extensions 100 to max;
 }
@@ -271,6 +274,8 @@ message VariousComplexOptions {
   option (.protobuf_unittest.complex_opt1).foo = 42;
   option (protobuf_unittest.complex_opt1).(.protobuf_unittest.quux) = 324;
   option (.protobuf_unittest.complex_opt1).(protobuf_unittest.corge).qux = 876;
+  option (protobuf_unittest.complex_opt1).foo4 = 99;
+  option (protobuf_unittest.complex_opt1).foo4 = 88;
   option (complex_opt2).baz = 987;
   option (complex_opt2).(grault) = 654;
   option (complex_opt2).bar.foo = 743;
@@ -281,6 +286,8 @@ message VariousComplexOptions {
   option (complex_opt2).(protobuf_unittest.garply).(corge).qux = 2121;
   option (ComplexOptionType2.ComplexOptionType4.complex_opt4).waldo = 1971;
   option (complex_opt2).fred.waldo = 321;
+  option (complex_opt2).barney = { waldo: 101 };
+  option (complex_opt2).barney = { waldo: 212 };
   option (protobuf_unittest.complex_opt3).qux = 9;
   option (complex_opt3).complexoptiontype5.plugh = 22;
   option (complexopt6).xyzzy = 24;
@@ -385,3 +392,30 @@ message NestedOptionType {
     optional int32 nested_extension = 7912573 [(field_opt2) = 1005];
   }
 }
+
+// Custom message option that has a required enum field.
+// WARNING: this is strongly discouraged!
+message OldOptionType {
+  enum TestEnum {
+    OLD_VALUE = 0;
+  }
+  required TestEnum value = 1;
+}
+
+// Updated version of the custom option above.
+message NewOptionType {
+  enum TestEnum {
+    OLD_VALUE = 0;
+    NEW_VALUE = 1;
+  }
+  required TestEnum value = 1;
+}
+
+extend google.protobuf.MessageOptions {
+  optional OldOptionType required_enum_opt = 106161807;
+}
+
+// Test message using the "required_enum_opt" option defined above.
+message TestMessageWithRequiredEnumOption {
+  option (required_enum_opt) = { value: OLD_VALUE };
+}