Move CUP to new component client_update_protocol

components/client_update_protocol/BUILD.gn

-# Copyright 2014 The Chromium Authors. All rights reserved.
+# Copyright 2016 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.
 
-source_set("crx_file") {
+source_set("client_update_protocol") {
   sources = [
-    "crx_file.cc",
-    "crx_file.h",
-    "id_util.cc",
-    "id_util.h",
+    "ecdsa.cc",
+    "ecdsa.h",
   ]
 
   deps = [
     "//base",
     "//crypto",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
-    "id_util_unittest.cc",
+    "ecdsa_unittest.cc",
   ]
 
   deps = [
-    ":crx_file",
+    ":client_update_protocol",
     "//base",
+    "//crypto",
     "//testing/gtest",
   ]
 }