Convert test_support source sets to static libs

components/gcm_driver/instance_id/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.
 
 # GYP version: components/gcm_driver.gypi:instance_id_driver
-source_set("instance_id") {
+static_library("instance_id") {
   sources = [
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "instance_id.cc",
     "instance_id.h",
     "instance_id_driver.cc",
     "instance_id_driver.h",
     "instance_id_impl.cc",
     "instance_id_impl.h",
   ]
@@ skipping 12 matching lines @@
     ]
     sources += [
       "instance_id_android.cc",
       "instance_id_android.h",
     ]
     deps += [ "android:jni_headers" ]
   }
 }
 
 # GYP version: components/gcm_driver.gypi:instance_id_test_support
-source_set("test_support") {
+static_library("test_support") {
   testonly = true
   sources = [
     "fake_gcm_driver_for_instance_id.cc",
     "fake_gcm_driver_for_instance_id.h",
     "scoped_use_fake_instance_id_android.cc",
     "scoped_use_fake_instance_id_android.h",
   ]
 
   public_deps = [
     ":instance_id",
@@ skipping 16 matching lines @@
   ]
 
   deps = [
     ":instance_id",
     ":test_support",
     "//base",
     "//google_apis/gcm",
     "//testing/gtest",
   ]
 }