Convert some GN test support targets to static libs.

components/password_manager/core/browser/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.
 
 import("//third_party/protobuf/proto_library.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
@@ skipping 147 matching lines @@
   # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
 
 proto_library("proto") {
   sources = [
     "affiliation_api.proto",
   ]
 }
 
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "fake_affiliation_api.cc",
     "fake_affiliation_api.h",
     "fake_affiliation_fetcher.cc",
     "fake_affiliation_fetcher.h",
     "mock_affiliated_match_helper.cc",
     "mock_affiliated_match_helper.h",
     "mock_affiliation_consumer.cc",
     "mock_affiliation_consumer.h",
@@ skipping 115 matching lines @@
     "//components/variations",
     "//net:test_support",
     "//sql:test_support",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }