Convert some GN test support targets to static libs.

components/update_client/BUILD.gn

 # Copyright 2014 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("update_client") {
+static_library("update_client") {
   sources = [
     "action.cc",
     "action.h",
     "action_update.cc",
     "action_update.h",
     "action_update_check.cc",
     "action_update_check.h",
     "action_wait.cc",
     "action_wait.h",
     "background_downloader_win.cc",
@@ skipping 43 matching lines @@
     "//components/prefs",
     "//courgette:courgette_lib",
     "//crypto",
     "//net",
     "//third_party/libxml",
     "//third_party/zlib:zip",
     "//url",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "test_configurator.cc",
     "test_configurator.h",
     "test_installer.cc",
     "test_installer.h",
     "url_request_post_interceptor.cc",
     "url_request_post_interceptor.h",
   ]
 
@@ skipping 53 matching lines @@
     "//base",
     "//components/prefs",
     "//components/prefs:test_support",
     "//courgette:courgette_lib",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libxml",
   ]
 }