Convert some GN test support targets to static libs.

components/proximity_auth/cryptauth/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("cryptauth") {
+static_library("cryptauth") {
   sources = [
     "cryptauth_access_token_fetcher.h",
     "cryptauth_access_token_fetcher_impl.cc",
     "cryptauth_access_token_fetcher_impl.h",
     "cryptauth_api_call_flow.cc",
     "cryptauth_api_call_flow.h",
     "cryptauth_client.h",
     "cryptauth_client_impl.cc",
     "cryptauth_client_impl.h",
     "cryptauth_device_manager.cc",
@@ skipping 30 matching lines @@
     "//crypto",
     "//google_apis",
     "//net",
   ]
 
   public_deps = [
     "//components/proximity_auth/cryptauth/proto",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
 
   sources = [
     "fake_cryptauth_gcm_manager.cc",
     "fake_cryptauth_gcm_manager.h",
     "fake_secure_message_delegate.cc",
     "fake_secure_message_delegate.h",
     "mock_cryptauth_client.cc",
     "mock_cryptauth_client.h",
     "mock_sync_scheduler.cc",
@@ skipping 30 matching lines @@
     ":test_support",
     "//base/test:test_support",
     "//components/gcm_driver:test_support",
     "//components/prefs:test_support",
     "//components/proximity_auth",
     "//google_apis:test_support",
     "//net:test_support",
     "//testing/gtest",
   ]
 }