Remove remaining usages of tsl::protobuf

The alias namespace tsl::protobuf has been deprecated for a while, so this change cleans up all the remaining usages.

PiperOrigin-RevId: 850662585

Author: beckerhe

tsl/platform/BUILD

@@ -198,6 +198,7 @@ cc_library(
     deps = [
         ":platform",
         ":tstring",
+        "@com_google_absl//absl/base:core_headers",
         "@xla//xla/tsl/platform:types",
     ] + tsl_protobuf_deps(),
 )

tsl/platform/protobuf.h

@@ -21,6 +21,7 @@ limitations under the License.
 #include <string>
 #include <utility>
 
+#include "absl/base/macros.h"
 #include "xla/tsl/platform/types.h"
 #include "tsl/platform/platform.h"
 
@@ -57,8 +58,8 @@ limitations under the License.
 namespace tsl {
 
 namespace protobuf = ::google::protobuf;
-using protobuf_int64 = int64_t;
-using protobuf_uint64 = uint64_t;
+using protobuf_int64 ABSL_DEPRECATE_AND_INLINE() = int64_t;
+using protobuf_uint64 ABSL_DEPRECATE_AND_INLINE() = uint64_t;
 extern const char* kProtobufInt64Typename;
 extern const char* kProtobufUint64Typename;