Delete CSS paint code (flutter#20426)

* Delete CSS paint code

Author: yjbanov

ci/licenses_golden/licenses_flutter

@@ -419,7 +419,6 @@ FILE: ../../../flutter/lib/ui/window/viewport_metrics.cc
 FILE: ../../../flutter/lib/ui/window/viewport_metrics.h
 FILE: ../../../flutter/lib/ui/window/window.cc
 FILE: ../../../flutter/lib/ui/window/window.h
-FILE: ../../../flutter/lib/web_ui/lib/assets/houdini_painter.js
 FILE: ../../../flutter/lib/web_ui/lib/src/engine.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/alarm_clock.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/assets.dart
@@ -463,7 +462,6 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/dom_renderer.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/engine_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/frame_reference.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/history.dart
-FILE: ../../../flutter/lib/web_ui/lib/src/engine/houdini_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html_image_codec.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/keyboard.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/mouse_cursor.dart