Remove non USE_AURA code from views files.

ui/gfx/screen_win.cc

Index: ui/gfx/screen_win.cc
diff --git a/ui/gfx/screen_win.cc b/ui/gfx/screen_win.cc
index d207db0fecb21cda92adfa73251049733848ba3f..845249a335304b023b989636fca219321a00e8af 100644
--- a/ui/gfx/screen_win.cc
+++ b/ui/gfx/screen_win.cc
@@ -146,27 +146,13 @@ void ScreenWin::RemoveObserver(DisplayObserver* observer) {
 }
 
 HWND ScreenWin::GetHWNDFromNativeView(NativeView window) const {
-#if defined(USE_AURA)
   NOTREACHED();
   return NULL;
-#else
-  return window;
-#endif  // USE_AURA
 }
 
 NativeWindow ScreenWin::GetNativeWindowFromHWND(HWND hwnd) const {
-#if defined(USE_AURA)
   NOTREACHED();
   return NULL;
-#else
-  return hwnd;
-#endif  // USE_AURA
 }
 
-#if !defined(USE_AURA)
-Screen* CreateNativeScreen() {
-  return new ScreenWin;
-}
-#endif  // !USE_AURA
-
 }  // namespace gfx