Make gn generate on Win

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index cddfbfac9ae357b0968549ee0344f99a6307b0e9..ff29e36eb89afc01a079c414713a2d89e9f2ae7f 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -304,11 +304,16 @@ test("ash_unittests") {
     cflags = [ "/wd4267" ]
   }
 
+  if (!use_x11 || !is_chromeos) {
+    sources -= [
+      "touch/touch_transformer_controller_unittest.cc",
+    ]
+  }
+
   if (!use_x11) {
     sources -= [
       "accelerators/magnifier_key_scroller_unittest.cc",
       "accelerators/spoken_feedback_toggler_unittest.cc",
-      "touch/touch_transformer_controller_unittest.cc",
     ]
   }
   if (is_chromeos) {
@@ -324,7 +329,6 @@ test("ash_unittests") {
   } else {
     sources -= [
       "display/resolution_notification_controller_unittest.cc",
-      "touch/touch_transformer_controller_unittest.cc",
       "touch/touchscreen_util_unittest.cc",
     ]
   }