Revert "Add support for content_id to SendGridAdapter (beam-community…

…#640)" (beam-community#650)

This reverts commit 49a6d5a.

lib/bamboo/adapters/send_grid_adapter.ex

@@ -368,26 +368,17 @@ defmodule Bamboo.SendGridAdapter do
 
  defp put_click_tracking(body, _), do: body
 
- defp is_inline_image?(%_{content_type: "image/" <> _, content_id: cid}) when not is_nil(cid),
- do: true
-
- defp is_inline_image?(_), do: false
-
  defp put_attachments(body, %Email{attachments: []}), do: body
 
  defp put_attachments(body, %Email{attachments: attachments}) do
  transformed =
  attachments
  |> Enum.reverse()
  |> Enum.map(fn attachment ->
- disposition = if is_inline_image?(attachment), do: "inline", else: "attachment"
-
  %{
  filename: attachment.filename,
  type: attachment.content_type,
- disposition: disposition,
- content: Base.encode64(attachment.data),
- content_id: attachment.content_id
+ content: Base.encode64(attachment.data)
  }
  end)