Update //third_party/protobuf to version 3.

third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto

Index: third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
diff --git a/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
new file mode 100644
index 0000000000000000000000000000000000000000..c0da8b422ee69c576b4473acce68ec4a2bf3c648
--- /dev/null
+++ b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
@@ -0,0 +1,28 @@
+package protobuf_unittest;
+
+option java_package = "com.google.protobuf";
+option java_outer_classname = "EnumValidity";
+
+enum E {
+  default = 1; // test java keyword renaming
+  FOO = 2;
+  BAR = 3;
+  BAZ = 4;
+}
+
+message M {
+  optional E optional_e = 1;
+  optional E default_e = 2 [ default = BAZ ];
+  repeated E repeated_e = 3;
+  repeated E packed_e = 4 [ packed = true ];
+  repeated E repeated_e2 = 5;
+  repeated E packed_e2 = 6 [ packed = true ];
+  repeated E repeated_e3 = 7;
+  repeated E packed_e3 = 8 [ packed = true ];
+}
+
+message Alt {
+  optional E repeated_e2_as_optional = 5;
+  repeated E packed_e2_as_non_packed = 6;
+  repeated E non_packed_e3_as_packed = 7 [ packed = true ];
+}