Remove unused proplists_merge.

src/oauth_util.erl

@@ -37,13 +37,3 @@ esprintf(Fmt, Values) when is_tuple(Values) ->
   esprintf(Fmt, tuple_to_list(Values));
 esprintf(Fmt, Values) when is_list(Values) ->
   fmt:sprintf(Fmt, [fmt:percent_encode(Value) || Value <- Values]).
-
-proplists_merge({K,V}, Merged) ->
-  case proplists:is_defined(K, Merged) of
-    true ->
-      Merged;
-    false ->
-      [{K,V}|Merged]
-  end;
-proplists_merge(A, B) ->
-  lists:foldl(fun proplists_merge/2, A, B).