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

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

Index: third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto
diff --git a/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto b/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto
deleted file mode 100644
index 3b7a004c9e2b1a34bf02afb4e640c9aa4cfd626c..0000000000000000000000000000000000000000
--- a/third_party/protobuf/javanano/src/test/java/com/google/protobuf/nano/unittest_extension_packed_nano.proto
+++ /dev/null
@@ -1,29 +0,0 @@
-syntax = "proto2";
-
-option java_multiple_files = true;
-option java_package = "com.google.protobuf";
-
-import "google/protobuf/nano/unittest_extension_nano.proto";
-
-// Must be compiled separately due to extension number reuse.
-// The reuse is deliberate, for testing wire compatibility.
-
-message PackedExtensions {
-  extend ExtendableMessage {
-    repeated int32    packed_int32    = 10 [ packed = true ];
-    repeated uint32   packed_uint32   = 11 [ packed = true ];
-    repeated sint32   packed_sint32   = 12 [ packed = true ];
-    repeated int64    packed_int64    = 13 [ packed = true ];
-    repeated uint64   packed_uint64   = 14 [ packed = true ];
-    repeated sint64   packed_sint64   = 15 [ packed = true ];
-    repeated fixed32  packed_fixed32  = 16 [ packed = true ];
-    repeated sfixed32 packed_sfixed32 = 17 [ packed = true ];
-    repeated fixed64  packed_fixed64  = 18 [ packed = true ];
-    repeated sfixed64 packed_sfixed64 = 19 [ packed = true ];
-    repeated bool     packed_bool     = 20 [ packed = true ];
-    repeated float    packed_float    = 21 [ packed = true ];
-    repeated double   packed_double   = 22 [ packed = true ];
-    repeated AnEnum   packed_enum     = 23 [ packed = true ];
-    // Non-packable types omitted.
-  }
-}