ui/aura: No need to not check for 'use_aura' in a aura specific build file.

ui/aura/BUILD.gn

Index: ui/aura/BUILD.gn
diff --git a/ui/aura/BUILD.gn b/ui/aura/BUILD.gn
index c06a9e1dc3d8b1ac68d5a3bce07fe9bb89f843e7..d5ad05fc59a80ca4722b10844285cb7e4db99b66 100644
--- a/ui/aura/BUILD.gn
+++ b/ui/aura/BUILD.gn
@@ -185,25 +185,19 @@ source_set("test_support") {
   ]
 
   if (is_win) {
+    sources += [ "test/ui_controls_factory_aurawin.cc" ]
+
     cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   }
 
   if (use_x11) {
-    deps += [ "//ui/gfx/x" ]
-  }
-
-  if (use_aura) {
-    if (is_win) {
-      sources += [ "test/ui_controls_factory_aurawin.cc" ]
-    }
+    sources += [
+      "test/ui_controls_factory_aurax11.cc",
+      "test/x11_event_sender.cc",
+      "test/x11_event_sender.h",
+    ]
 
-    if (use_x11) {
-      sources += [
-        "test/ui_controls_factory_aurax11.cc",
-        "test/x11_event_sender.cc",
-        "test/x11_event_sender.h",
-      ]
-    }
+    deps += [ "//ui/gfx/x" ]
   }
 }