Remove build rule for non-existing file.

Author: mingmingl-llvm

tensorflow_serving/batching/BUILD

@@ -70,18 +70,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "threadsafe_status",
-    srcs = ["threadsafe_status.cc"],
-    hdrs = ["threadsafe_status.h"],
-    deps = [
-        "@com_google_absl//absl/base:core_headers",
-        "@com_google_absl//absl/status",
-        "@com_google_absl//absl/synchronization",
-        "@org_tensorflow//tensorflow/core:lib",
-    ],
-)
-
 cc_test(
     name = "batching_session_test",
     srcs = [