Convert some component source sets to static library

components/nacl/common/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")
 
 if (enable_nacl) {
   # This is separate so it can be used by ../broker:nacl64.
-  source_set("minimal") {
+  static_library("minimal") {
     sources = [
       "nacl_cmd_line.cc",
       "nacl_cmd_line.h",
       "nacl_constants.cc",
       "nacl_constants.h",
       "nacl_messages.cc",
       "nacl_messages.h",
       "nacl_process_type.h",
       "nacl_renderer_messages.cc",
       "nacl_renderer_messages.h",
@@ skipping 22 matching lines @@
   # not be in the nacl64.exe build).
   source_set("minimal_content_dummy") {
     check_includes = false
     sources = [
       "//content/public/common/content_switches.h",
       "//content/public/common/process_type.h",
       "//content/public/common/sandbox_type.h",
     ]
   }
 
-  source_set("common") {
+  static_library("common") {
     sources = [
       "nacl_host_messages.cc",
       "nacl_host_messages.h",
       "nacl_nonsfi_util.cc",
       "nacl_nonsfi_util.h",
       "pnacl_types.cc",
       "pnacl_types.h",
     ]
 
     public_deps = [
@@ skipping 35 matching lines @@
 source_set("process_type") {
   public = [
     "nacl_process_type.h",
   ]
 
   deps = [
     "//content/public/common",
   ]
 }
 
-source_set("switches") {
+static_library("switches") {
   sources = [
     "nacl_switches.cc",
     "nacl_switches.h",
   ]
 }