Convert some component source sets to static library

components/client_update_protocol/BUILD.gn

 # 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("client_update_protocol") {
+static_library("client_update_protocol") {
   sources = [
     "ecdsa.cc",
     "ecdsa.h",
   ]
 
   deps = [
     "//base",
     "//crypto",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "ecdsa_unittest.cc",
   ]
 
   deps = [
     ":client_update_protocol",
     "//base",
     "//crypto",
     "//testing/gtest",
   ]
 }