Remove ephelper and other endpoints code.

appengine/ephelper/epfrontend/json.go

Index: appengine/ephelper/epfrontend/json.go
diff --git a/appengine/ephelper/epfrontend/json.go b/appengine/ephelper/epfrontend/json.go
deleted file mode 100644
index a7a603359809112dbc23c8a3cb0605a828f4e991..0000000000000000000000000000000000000000
--- a/appengine/ephelper/epfrontend/json.go
+++ /dev/null
@@ -1,31 +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 epfrontend
-
-import (
-	"encoding/json"
-)
-
-type jsonRWRawMessage struct {
-	v   interface{}
-	raw []byte
-}
-
-var _ interface {
-	json.Marshaler
-	json.Unmarshaler
-} = (*jsonRWRawMessage)(nil)
-
-func (m *jsonRWRawMessage) MarshalJSON() ([]byte, error) {
-	if m.raw != nil {
-		return m.raw, nil
-	}
-	return json.Marshal(m.v)
-}
-
-func (m *jsonRWRawMessage) UnmarshalJSON(data []byte) error {
-	m.raw = data
-	return nil
-}