Remove these files from BUILD.gn

sky/sdk/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("//mojo/public/dart/rules.gni")
 
 dart_pkg("sdk") {
   sources = [
     "CHANGELOG.md",
     "README.md",
@@ skipping 36 matching lines @@
     "lib/framework/components/radio.dart",
     "lib/framework/components/scaffold.dart",
     "lib/framework/components/scrollable.dart",
     "lib/framework/components/tool_bar.dart",
     "lib/framework/debug/shake-to-reload.sky",
     "lib/framework/debug/tracing.dart",
     "lib/framework/debug/utils.dart",
     "lib/framework/editing/editable_string.dart",
     "lib/framework/editing/editable_text.dart",
     "lib/framework/editing/keyboard.dart",
-    "lib/framework/elements/animation/controller.dart",
-    "lib/framework/elements/animation/timer.dart",
-    "lib/framework/elements/material-element.sky",
-    "lib/framework/elements/shadow.sky",
-    "lib/framework/elements/sky-box.sky",
-    "lib/framework/elements/sky-button.sky",
-    "lib/framework/elements/sky-checkbox.sky",
-    "lib/framework/elements/sky-drawer-header.sky",
-    "lib/framework/elements/sky-drawer.sky",
-    "lib/framework/elements/sky-element.sky",
-    "lib/framework/elements/sky-icon.sky",
-    "lib/framework/elements/sky-ink-splash.sky",
-    "lib/framework/elements/sky-input.sky",
-    "lib/framework/elements/sky-menu-divider.sky",
-    "lib/framework/elements/sky-menu-item.sky",
-    "lib/framework/elements/sky-radio.sky",
-    "lib/framework/elements/sky-scrollable.sky",
-    "lib/framework/elements/sky-toolbar.sky",
     "lib/framework/embedder.dart",
     "lib/framework/fn.dart",
     "lib/framework/layout.dart",
     "lib/framework/net/fetch.dart",
     "lib/framework/net/image_cache.dart",
     "lib/framework/node.dart",
     "lib/framework/reflect.dart",
     "lib/framework/shell.dart",
     "lib/framework/theme/colors.dart",
     "lib/framework/theme/shadows.dart",
@@ skipping 51 matching lines @@
     "//sky/services/viewport",
   ]
 
   datadeps = [
     "//sky/services/testing:bindings",
     "//sky/engine/bindings",
   ]
 
   sdk_ext_directory = "$root_gen_dir/sky/bindings"
 }