Get `gn gen` to succeed on Windows

ui/views/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/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("views.gyp") ],
@@ skipping 27 matching lines @@
     "//ui/events:events_base",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (use_x11 && !is_chromeos) {
     deps += [ "//ui/display/util" ]
   }
 
-  if (is_win) {
-    sources += gypi_values.views_win_sources
-    cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    libs = [ "/imm32.lib", "oleacc.lib" ]
-    ldflags = [ "/DELAYLOAD:user32.dll" ]
-    deps += [
-      "//third_party/iaccessible2",
-      "//third_party/wtl",
-    ]
-  }
-
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xrandr",
     ]
     deps += [
       "//ui/events/platform/x11",
@@ skipping 113 matching lines @@
   }
   if (use_x11) {
     deps += [
       "//ui/events/platform/x11",
       "//ui/gfx/x",
     ]
   }
 }
 
 }  # if (false)