DecoderCallback has API docs saying to use ImageProvider.loadBuffer but the deprecated annotation says to use ImageProvider.loadImage. ImageProvider.load has API docs saying to loadBuffer is preferred but an annotation that says to use loadImage. loadBuffer is itself deprecated and says to use loadImage. On the other hand, AssetBundleImageProvider implements all three. The documentation for ImageProvider itself says that we use loadBuffer.

cc @tvolkert @jonahwilliams