Remove cel::Data, cel::ReferenceCount, and related internal primitives

PiperOrigin-RevId: 994577785

Author: jcking

common/BUILD

@@ -894,18 +894,11 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "reference_count",
-    hdrs = ["reference_count.h"],
-    deps = ["//common/internal:reference_count"],
-)
-
 cc_library(
     name = "allocator",
     hdrs = ["allocator.h"],
     deps = [
         ":arena",
-        ":data",
         "//internal:new",
         "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/base:nullability",
@@ -927,29 +920,6 @@ cc_test(
     ],
 )
 
-cc_library(
-    name = "data",
-    hdrs = ["data.h"],
-    deps = [
-        "//common/internal:metadata",
-        "@com_google_absl//absl/base:nullability",
-        "@com_google_absl//absl/log:absl_check",
-        "@com_google_protobuf//:protobuf",
-    ],
-)
-
-cc_test(
-    name = "data_test",
-    srcs = ["data_test.cc"],
-    deps = [
-        ":data",
-        "//common/internal:reference_count",
-        "//internal:testing",
-        "@com_google_absl//absl/base:nullability",
-        "@com_google_protobuf//:protobuf",
-    ],
-)
-
 cc_library(
     name = "optional_ref",
     hdrs = ["optional_ref.h"],

common/allocator.h

@@ -27,7 +27,6 @@
 #include "absl/log/die_if_null.h"
 #include "absl/numeric/bits.h"
 #include "common/arena.h"
-#include "common/data.h"
 #include "internal/new.h"
 #include "google/protobuf/arena.h"
 
@@ -291,9 +290,6 @@ class ArenaAllocator<void> {
     using U = std::remove_const_t<T>;
     U* object;
     if constexpr (google::protobuf::Arena::is_arena_constructable<U>::value) {
-      // Classes derived from `cel::Data` are manually allocated and constructed
-      // as those class support determining whether the destructor is skippable
-      // at runtime.
       object = google::protobuf::Arena::Create<U>(arena(), std::forward<Args>(args)...);
     } else {
       if constexpr (ArenaTraits<>::constructible<U>()) {
@@ -309,8 +305,7 @@ class ArenaAllocator<void> {
         }
       }
     }
-    if constexpr (google::protobuf::Arena::is_arena_constructable<U>::value ||
-                  std::is_base_of_v<Data, U>) {
+    if constexpr (google::protobuf::Arena::is_arena_constructable<U>::value) {
       ABSL_DCHECK_EQ(object->GetArena(), arena());
     }
     return object;
@@ -322,8 +317,7 @@ class ArenaAllocator<void> {
   void delete_object(T* p) noexcept {
     using U = std::remove_const_t<T>;
     ABSL_DCHECK(p != nullptr);
-    if constexpr (google::protobuf::Arena::is_arena_constructable<U>::value ||
-                  std::is_base_of_v<Data, U>) {
+    if constexpr (google::protobuf::Arena::is_arena_constructable<U>::value) {
       ABSL_DCHECK_EQ(p->GetArena(), arena());
     }
   }

common/data.h

@@ -28,40 +28,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "reference_count",
-    srcs = ["reference_count.cc"],
-    hdrs = ["reference_count.h"],
-    deps = [
-        "//common:data",
-        "//internal:new",
-        "@com_google_absl//absl/base:core_headers",
-        "@com_google_absl//absl/base:nullability",
-        "@com_google_absl//absl/log:absl_check",
-        "@com_google_absl//absl/strings:string_view",
-        "@com_google_protobuf//:protobuf",
-    ],
-)
-
-cc_test(
-    name = "reference_count_test",
-    srcs = ["reference_count_test.cc"],
-    deps = [
-        ":reference_count",
-        "//common:data",
-        "//internal:testing",
-        "@com_google_absl//absl/base:nullability",
-        "@com_google_protobuf//:protobuf",
-        "@com_google_protobuf//:struct_cc_proto",
-    ],
-)
-
-cc_library(
-    name = "metadata",
-    hdrs = ["metadata.h"],
-    deps = ["@com_google_protobuf//:protobuf"],
-)
-
 cc_library(
     name = "byte_string",
     srcs = ["byte_string.cc"],