Pull new version of protobuf sources.

third_party/protobuf/src/google/protobuf/unknown_enum_test.proto

Index: third_party/protobuf/src/google/protobuf/unknown_enum_test.proto
diff --git a/third_party/protobuf/python/google/protobuf/internal/factory_test1.proto b/third_party/protobuf/src/google/protobuf/unknown_enum_test.proto
similarity index 67%
copy from third_party/protobuf/python/google/protobuf/internal/factory_test1.proto
copy to third_party/protobuf/src/google/protobuf/unknown_enum_test.proto
index 9f55e037f6e69ff8e76a3f260eff006af1bcce65..0ea1ede3fff6d646884b865d44790596d6a0038b 100644
--- a/third_party/protobuf/python/google/protobuf/internal/factory_test1.proto
+++ b/third_party/protobuf/src/google/protobuf/unknown_enum_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
@@ -28,28 +28,33 @@
 // (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: matthewtoia@google.com (Matt Toia)
+// Definitions of protos for testing cross-version compatibility.  The
+// UpRevision message acts as if it were a newer version of the DownRevision
+// message.  That is, UpRevision shares all the same fields as DownRevision,
+// but UpRevision can add fields and add enum values.
+syntax = "proto2";
 
+package google.protobuf.util;
 
-package google.protobuf.python.internal;
-
+message DownRevision {
+  enum Enum {
+    DEFAULT_VALUE = 2;
+    NONDEFAULT_VALUE = 3;
+  }
 
-enum Factory1Enum {
-  FACTORY_1_VALUE_0 = 0;
-  FACTORY_1_VALUE_1 = 1;
+  optional Enum value = 1 [default = DEFAULT_VALUE];
+  repeated Enum values = 2;
 }
 
-message Factory1Message {
-  optional Factory1Enum factory_1_enum = 1;
-  enum NestedFactory1Enum {
-    NESTED_FACTORY_1_VALUE_0 = 0;
-    NESTED_FACTORY_1_VALUE_1 = 1;
+message UpRevision {
+  enum Enum {
+    DEFAULT_VALUE = 2;
+    NONDEFAULT_VALUE = 3;
+    NEW_VALUE = 4;
+    NEW_VALUE_2 = 5;
+    NEW_VALUE_3 = 6;
   }
-  optional NestedFactory1Enum nested_factory_1_enum = 2;
-  message NestedFactory1Message {
-    optional string value = 1;
-  }
-  optional NestedFactory1Message nested_factory_1_message = 3;
-  optional int32 scalar_value = 4;
-  repeated string list_value = 5;
+
+  optional Enum value = 1 [default = DEFAULT_VALUE];
+  repeated Enum values = 2;
 }