Convert some GN test support targets to static libs.

ipc/BUILD.gn

 # Copyright (c) 2012 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("//build/config/nacl/config.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 component("ipc") {
@@ skipping 264 matching lines @@
       ":test_support",
       "//base",
       "//base:i18n",
       "//base/test:test_support",
       "//mojo/edk/system",
       "//mojo/edk/test:test_support",
       "//testing/gtest",
     ]
   }
 
-  source_set("test_support") {
+  static_library("test_support") {
     testonly = true
     sources = [
       "ipc_multiprocess_test.cc",
       "ipc_multiprocess_test.h",
       "ipc_perftest_support.cc",
       "ipc_perftest_support.h",
       "ipc_security_test_util.cc",
       "ipc_security_test_util.h",
       "ipc_test_base.cc",
       "ipc_test_base.h",
       "ipc_test_channel_listener.cc",
       "ipc_test_channel_listener.h",
       "ipc_test_sink.cc",
       "ipc_test_sink.h",
       "test_util_mac.cc",
       "test_util_mac.h",
     ]
     public_deps = [
       ":ipc",
     ]
     deps = [
       "//base",
       "//base/test:test_support",
       "//testing/gtest",
     ]
   }
 }