Remove unused functions

Author: josevalim

lib/ecto/adapters/postgres/connection.ex

@@ -1304,7 +1304,6 @@ if Code.ensure_loaded?(Postgrex) do
     defp ecto_to_db(:naive_datetime),      do: "timestamp"
     defp ecto_to_db(:naive_datetime_usec), do: "timestamp"
     defp ecto_to_db(atom) when is_atom(atom),  do: Atom.to_string(atom)
-    defp ecto_to_db(str)  when is_binary(str), do: str
     defp ecto_to_db(type) do
       raise ArgumentError,
             "unsupported type `#{inspect(type)}`. The type can either be an atom, a string " <>

lib/ecto/adapters/tds/connection.ex

@@ -1613,15 +1613,12 @@ if Code.ensure_loaded?(Tds) do
       Atom.to_string(atom)
     end
 
-    defp ecto_to_db(str, nil, nil, nil, _)  when is_binary(str), do: str
-
     defp ecto_to_db(type, _, _, _, _) do
       raise ArgumentError,
             "unsupported type `#{inspect(type)}`. The type can either be an atom, a string " <>
               "or a tuple of the form `{:map, t}` where `t` itself follows the same conditions."
     end
 
-
     defp error!(nil, message) do
       raise ArgumentError, message
     end

test/ecto/adapters/postgres_test.exs

@@ -1200,7 +1200,7 @@ defmodule Ecto.Adapters.PostgresTest do
               [{:add, :name, :string, [default: "Untitled", size: 20, null: false]},
                {:add, :price, :numeric, [precision: 8, scale: 2, default: {:fragment, "expr"}]},
                {:add, :on_hand, :integer, [default: 0, null: true]},
-               {:add, :published_at, "time without time zone", [null: true]},
+               {:add, :published_at, :"time without time zone", [null: true]},
                {:add, :is_active, :boolean, [default: true]},
                {:add, :tags, {:array, :string}, [default: []]},
                {:add, :languages, {:array, :string}, [default: ["pt", "es"]]},

test/ecto/adapters/tds_test.exs

@@ -1121,8 +1121,8 @@ defmodule Ecto.Adapters.TdsTest do
          {:add, :name, :string, [default: "Untitled", size: 20, null: false]},
          {:add, :price, :numeric, [precision: 8, scale: 2, default: {:fragment, "expr"}]},
          {:add, :on_hand, :integer, [default: 0, null: true]},
-         {:add, :likes, "smallint unsigned", [default: 0, null: false]},
-         {:add, :published_at, "datetime(6)", [null: true]},
+         {:add, :likes, :"smallint unsigned", [default: 0, null: false]},
+         {:add, :published_at, :"datetime(6)", [null: true]},
          {:add, :is_active, :boolean, [default: true]}
        ]}