Remove dead merge conflict code.

api/resource/conflictdetector.go

@@ -1,20 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-package resource
-
-import "sigs.k8s.io/kustomize/api/resid"
-
-// ConflictDetector detects conflicts between resources.
-type ConflictDetector interface {
-	// HasConflict returns true if the given resources have a conflict.
-	HasConflict(patch1, patch2 *Resource) (bool, error)
-	// Merge two resources into one.
-	MergePatches(patch1, patch2 *Resource) (*Resource, error)
-}
-
-// ConflictDetectorFactory makes instances of ConflictDetector that know
-// how to handle the given Group, Version, Kind tuple.
-type ConflictDetectorFactory interface {
-	New(gvk resid.Gvk) (ConflictDetector, error)
-}