Removed "no_arena" variants from the build system.

BUILD

@@ -486,7 +486,6 @@ RELATIVE_LITE_TEST_PROTOS = [
     "google/protobuf/unittest_import_lite.proto",
     "google/protobuf/unittest_import_public_lite.proto",
     "google/protobuf/unittest_lite.proto",
-    "google/protobuf/unittest_no_arena_lite.proto",
 ]
 
 LITE_TEST_PROTOS = ["src/" + s for s in RELATIVE_LITE_TEST_PROTOS]
@@ -513,8 +512,6 @@ RELATIVE_TEST_PROTOS = [
     "google/protobuf/unittest_lite_imports_nonlite.proto",
     "google/protobuf/unittest_mset.proto",
     "google/protobuf/unittest_mset_wire_format.proto",
-    "google/protobuf/unittest_no_arena.proto",
-    "google/protobuf/unittest_no_arena_import.proto",
     "google/protobuf/unittest_no_field_presence.proto",
     "google/protobuf/unittest_no_generic_services.proto",
     "google/protobuf/unittest_optimize_for.proto",

objectivec/DevTools/compile_testing_protos.sh

@@ -42,8 +42,6 @@ CORE_PROTO_FILES=(
   src/google/protobuf/unittest_lite.proto
   src/google/protobuf/unittest_mset.proto
   src/google/protobuf/unittest_mset_wire_format.proto
-  src/google/protobuf/unittest_no_arena.proto
-  src/google/protobuf/unittest_no_arena_import.proto
   src/google/protobuf/unittest_no_generic_services.proto
   src/google/protobuf/unittest_optimize_for.proto
   src/google/protobuf/unittest.proto