Convert some component source sets to static library

components/ntp_tiles/BUILD.gn

 # Copyright 2016 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.
 
 assert(!is_ios)  # TODO(sfiera): support iOS http://crbug.com/617966
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 # GYP version: components/ntp_tiles.gypi:ntp_tiles
-source_set("ntp_tiles") {
+static_library("ntp_tiles") {
   sources = [
     "constants.cc",
     "constants.h",
     "most_visited_sites.cc",
     "most_visited_sites.h",
     "popular_sites.cc",
     "popular_sites.h",
     "pref_names.cc",
     "pref_names.h",
     "switches.cc",
@@ skipping 28 matching lines @@
   ]
 }
 
 if (is_android) {
   java_cpp_enum("ntp_tiles_enums_java") {
     sources = [
       "most_visited_sites.h",
     ]
   }
 }