Remove unnecessary EmbeddedObjects

Clarify the tests in embedded_test.go to indicate that unmarshalling
of an internal object (runtime.EmbeddedObject) will not work.  Instead,
consumers should decode raw external objects.

pkg/api/conversion.go

@@ -23,33 +23,3 @@ import (
 // Codec is the identity codec for this package - it can only convert itself
 // to itself.
 var Codec = runtime.CodecFor(Scheme, "")
-
-// EmbeddedObject implements a Codec specific version of an
-// embedded object.
-type EmbeddedObject struct {
-	runtime.Object
-}
-
-// UnmarshalJSON implements the json.Unmarshaler interface.
-func (a *EmbeddedObject) UnmarshalJSON(b []byte) error {
-	obj, err := runtime.CodecUnmarshalJSON(Codec, b)
-	a.Object = obj
-	return err
-}
-
-// MarshalJSON implements the json.Marshaler interface.
-func (a EmbeddedObject) MarshalJSON() ([]byte, error) {
-	return runtime.CodecMarshalJSON(Codec, a.Object)
-}
-
-// SetYAML implements the yaml.Setter interface.
-func (a *EmbeddedObject) SetYAML(tag string, value interface{}) bool {
-	obj, ok := runtime.CodecSetYAML(Codec, tag, value)
-	a.Object = obj
-	return ok
-}
-
-// GetYAML implements the yaml.Getter interface.
-func (a EmbeddedObject) GetYAML() (tag string, value interface{}) {
-	return runtime.CodecGetYAML(Codec, a.Object)
-}