Revert https://codereview.chromium.org/1291903002 (protobuf roll).

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
deleted file mode 100644
index c0da8b422ee69c576b4473acce68ec4a2bf3c648..0000000000000000000000000000000000000000
--- a/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_enum_validity_nano.proto
+++ /dev/null
@@ -1,28 +0,0 @@
-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 ];
-}