WebUI: Replace vulcanize with polymer-bundler

chrome/browser/resources/settings/BUILD.gn

 import("../vulcanize.gni")
 import("//tools/grit/grit_rule.gni")
 import("//chrome/common/features.gni")
 
 app_unbuilt = "vulcanized.unbuilt.html"
 lazy_load_unbuilt = "lazy_load.vulcanized.unbuilt.html"
 settings_pak_file = "settings_resources.pak"
 unpak_folder = "settings_resources.unpak"
 
 vulcanize("vulcanize_app") {
   host = "md-settings"
-  html_in_file = "settings.html"
-  html_out_file = app_unbuilt
+  html_in_files = [
+    "settings.html",
+    "lazy_load.html",
+  ]
+  html_out_files = [
+    app_unbuilt,
+    lazy_load_unbuilt,
+  ]
   insert_in_head = "<base href=\"chrome://\$i18n{hostname}\">"
   input = rebase_path("$target_gen_dir/$unpak_folder", root_build_dir)
-  js_out_file = "crisper.js"
+  js_out_files = [
+    "crisper.js",
+    "lazy_load.crisper.js",
+  ]
 
   deps = [
     ":unpak",
-  ]
-}
-
-vulcanize("vulcanize_lazy_load") {
-  host = "md-settings"
-  html_in_file = "lazy_load.html"
-  html_out_file = lazy_load_unbuilt
-  insert_in_head = "<base href=\"chrome://\$i18n{hostname}\">"
-  input = rebase_path("$target_gen_dir/$unpak_folder", root_build_dir)
-  js_out_file = "lazy_load.crisper.js"
-
-  excludes = [ "/settings.html" ]
-
-  deps = [
-    ":unpak",
   ]
 }
 
 unpak("unpak") {
   pak_file = settings_pak_file
   out_folder = unpak_folder
 
   deps = [
     ":flattened_resources",
   ]
 }
 
 polymer_css_build("build") {
   input_files = [
     app_unbuilt,
     lazy_load_unbuilt,
   ]
   output_files = [
     "vulcanized.html",
     "lazy_load.vulcanized.html",
   ]
   deps = [
     ":vulcanize_app",
-    ":vulcanize_lazy_load",
   ]
 }
 
 grit("flattened_resources") {
   source = "settings_resources.grd"
 
   # The .grd contains references to generated files.
   source_is_generated = true
 
   defines = chrome_grit_defines
   outputs = [
     "grit/settings_resources.h",
     "grit/settings_resources_map.cc",
     "grit/settings_resources_map.h",
     settings_pak_file,
   ]
   output_dir = "$root_gen_dir/chrome/browser/resources/settings"
 }