Convert some component source sets to static library

components/rlz/BUILD.gn

 # Copyright 2015 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("rlz") {
+static_library("rlz") {
   sources = [
     "rlz_tracker.cc",
     "rlz_tracker.h",
     "rlz_tracker_chromeos.cc",
     "rlz_tracker_delegate.h",
     "rlz_tracker_ios.cc",
     "rlz_tracker_mac.cc",
     "rlz_tracker_win.cc",
   ]
 
@@ skipping 15 matching lines @@
     "rlz_tracker_unittest.cc",
   ]
 
   deps = [
     ":rlz",
     "//net:test_support",
     "//rlz:test_support",
     "//ui/base",
   ]
 }