Switch "html" Mojo modules to the Sky module system

sky/viewer/BUILD.gn

 # Copyright 2014 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("//mojo/public/tools/bindings/mojom.gni")
 
 shared_library("viewer") {
   output_name = "sky_viewer"
 
   sources = [
@@ skipping 54 matching lines @@
     "//mojo/services/public/interfaces/network",
     "//mojo/services/public/interfaces/surfaces",
     "//net",
     "//skia",
     "//sky/engine/public:blink",
     "//sky/viewer/cc",
     "//third_party/icu",
     "//ui/native_theme",
     "//url",
     ":bindings",
-    ":html_modules",
+    ":sky_modules",
   ]
 }
 
 mojom("bindings") {
   sources = [
     "test_observer.mojom",
     "services/tracing.mojom",
     "services/inspector.mojom",
   ]
 }
 
-copy("html_modules") {
+copy("sky_modules") {
   sources = [
-    "script/core.html",
-    "script/support.html",
+    "script/core.sky",
+    "script/support.sky",
   ]
   outputs = [
-    "$root_gen_dir/mojo/public/html/{{source_file_part}}",
+    "$root_gen_dir/mojo/public/sky/{{source_file_part}}",
   ]
 }