Remove ephelper and other endpoints code.

appengine/ephelper/errors.go

Index: appengine/ephelper/errors.go
diff --git a/appengine/ephelper/errors.go b/appengine/ephelper/errors.go
deleted file mode 100644
index 82a192a95cc840ac58f15f184ad75da5887a1e71..0000000000000000000000000000000000000000
--- a/appengine/ephelper/errors.go
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package ephelper
-
-import (
-	"github.com/GoogleCloudPlatform/go-endpoints/endpoints"
-)
-
-// StripError converts the supplied error into an endpoints.APIError.
-//
-// If the error is not already an endpoints.APIError, InternalServerError
-// will be returned.
-func StripError(err error) *endpoints.APIError {
-	if err == nil {
-		return nil
-	}
-
-	epErr, ok := err.(*endpoints.APIError)
-	if !ok {
-		epErr = endpoints.InternalServerError.(*endpoints.APIError)
-	}
-	return epErr
-}