Remove deadcode related to legacy type adaptation.

PiperOrigin-RevId: 840888710

Author: jnthntatum

eval/public/BUILD

@@ -809,7 +809,6 @@ cc_library(
     deps = [
         "//base:data",
         "//eval/public/structs:legacy_type_adapter",
-        "//eval/public/structs:legacy_type_info_apis",
         "//eval/public/structs:legacy_type_provider",
         "//eval/public/structs:protobuf_descriptor_type_provider",
         "//runtime:type_registry",

eval/public/cel_type_registry.cc

@@ -22,33 +22,12 @@
 #include "absl/strings/string_view.h"
 #include "absl/types/optional.h"
 #include "eval/public/structs/legacy_type_adapter.h"
-#include "eval/public/structs/legacy_type_info_apis.h"
-#include "eval/public/structs/legacy_type_provider.h"
 #include "google/protobuf/descriptor.h"
 
 namespace google::api::expr::runtime {
 
 namespace {
 
-class LegacyToModernTypeProviderAdapter : public LegacyTypeProvider {
- public:
-  explicit LegacyToModernTypeProviderAdapter(const LegacyTypeProvider& provider)
-      : provider_(provider) {}
-
-  absl::optional<LegacyTypeAdapter> ProvideLegacyType(
-      absl::string_view name) const override {
-    return provider_.ProvideLegacyType(name);
-  }
-
-  absl::optional<const LegacyTypeInfoApis*> ProvideLegacyTypeInfo(
-      absl::string_view name) const override {
-    return provider_.ProvideLegacyTypeInfo(name);
-  }
-
- private:
-  const LegacyTypeProvider& provider_;
-};
-
 void AddEnumFromDescriptor(const google::protobuf::EnumDescriptor* desc,
                            CelTypeRegistry& registry) {
   std::vector<CelTypeRegistry::Enumerator> enumerators;