Convert some component source sets to static library

components/nacl/browser/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.
 
 import("//build/config/features.gni")
 
 assert(enable_nacl)
 
-source_set("browser") {
+static_library("browser") {
   sources = [
     "bad_message.cc",
     "bad_message.h",
     "nacl_broker_host_win.cc",
     "nacl_broker_host_win.h",
     "nacl_broker_service_win.cc",
     "nacl_broker_service_win.h",
     "nacl_browser.cc",
     "nacl_browser.h",
     "nacl_file_host.cc",
@@ skipping 64 matching lines @@
     "//base",
     "//components/nacl/common",
     "//content/test:test_support",
     "//net:test_support",
   ]
 
   if (is_linux) {
     sources += [ "../zygote/nacl_fork_delegate_linux_unittest.cc" ]
   }
 }