Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c

Index: third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c
diff --git a/third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c b/third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c
index 1c651c192ddcf5d3181cd9d52fe4ddf546ff7bfc..83afbc915db46c39626e79a3d295a70d9da6df54 100644
--- a/third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c
+++ b/third_party/protobuf/ruby/ext/google/protobuf_c/repeated_field.c
@@ -244,11 +244,6 @@ void* RepeatedField_index_native(VALUE _self, int index) {
   return RepeatedField_memoryat(self, index, element_size);
 }
 
-int RepeatedField_size(VALUE _self) {
-  RepeatedField* self = ruby_to_RepeatedField(_self);
-  return self->size;
-}
-
 /*
  * Private ruby method, used by RepeatedField.pop
  */
@@ -447,8 +442,9 @@ VALUE RepeatedField_eq(VALUE _self, VALUE _other) {
  */
 VALUE RepeatedField_hash(VALUE _self) {
   RepeatedField* self = ruby_to_RepeatedField(_self);
-  st_index_t h = rb_hash_start(0);
-  VALUE hash_sym = rb_intern("hash");
+
+  VALUE hash = LL2NUM(0);
+
   upb_fieldtype_t field_type = self->field_type;
   VALUE field_type_class = self->field_type_class;
   size_t elem_size = native_slot_size(field_type);
@@ -456,11 +452,12 @@ VALUE RepeatedField_hash(VALUE _self) {
   for (int i = 0; i < self->size; i++, off += elem_size) {
     void* mem = ((uint8_t *)self->elements) + off;
     VALUE elem = native_slot_get(field_type, field_type_class, mem);
-    h = rb_hash_uint(h, NUM2LONG(rb_funcall(elem, hash_sym, 0)));
+    hash = rb_funcall(hash, rb_intern("<<"), 1, INT2NUM(2));
+    hash = rb_funcall(hash, rb_intern("^"), 1,
+                      rb_funcall(elem, rb_intern("hash"), 0));
   }
-  h = rb_hash_end(h);
 
-  return INT2FIX(h);
+  return hash;
 }
 
 /*