Remove use of WS_EX_COMPOSITED for translucent windows.

ui/gfx/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("//build/config/ui.gni")
 import("//device/vr/features.gni")
 import("//testing/test.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 
 if (is_android) {
@@ skipping 161 matching lines @@
     "text_elider.h",
     "text_utils.cc",
     "text_utils.h",
     "text_utils_android.cc",
     "text_utils_ios.mm",
     "ui_gfx_exports.cc",
     "utf16_indexing.cc",
     "utf16_indexing.h",
     "vsync_provider.cc",
     "vsync_provider.h",
+    "win/constants.h",
     "win/direct_manipulation.cc",
     "win/direct_manipulation.h",
     "win/direct_write.cc",
     "win/direct_write.h",
     "win/hwnd_util.cc",
     "win/hwnd_util.h",
     "win/physical_size.cc",
     "win/physical_size.h",
     "win/rendering_window_manager.cc",
     "win/rendering_window_manager.h",
@@ skipping 571 matching lines @@
 
 fuzzer_test("color_transform_fuzztest") {
   sources = [
     "color_transform_fuzzer.cc",
   ]
   deps = [
     ":gfx",
   ]
   libfuzzer_options = [ "max_len=1024" ]
 }