Remove some unneeded code from an earlier iteration of this code.

test/core/end2end/cq_verifier.c

@@ -107,14 +107,6 @@ int contains_metadata(grpc_metadata_array *array, const char *key,
   return has_metadata(array->metadata, array->count, key, value);
 }
 
-int contains_metadata_key(grpc_metadata_array *array, const char *key) {
-  for (size_t i = 0; i < array->count; ++i) {
-    if (strcmp(array->metadata[i].key, key) == 0)
-      return 1;
-  }
-  return 0;
-}
-
 static gpr_slice merge_slices(gpr_slice *slices, size_t nslices) {
   size_t i;
   size_t len = 0;

test/core/end2end/cq_verifier.h

@@ -62,6 +62,5 @@ void cq_expect_completion(cq_verifier *v, void *tag, int success);
 int byte_buffer_eq_string(grpc_byte_buffer *byte_buffer, const char *string);
 int contains_metadata(grpc_metadata_array *array, const char *key,
                       const char *value);
-int contains_metadata_key(grpc_metadata_array *array, const char *key);
 
 #endif /* GRPC_TEST_CORE_END2END_CQ_VERIFIER_H */