Add Windows commandline switch --enable-views-textfield.

ui/views/controls/textfield/native_textfield_win.h

Index: ui/views/controls/textfield/native_textfield_win.h
diff --git a/ui/views/controls/textfield/native_textfield_win.h b/ui/views/controls/textfield/native_textfield_win.h
index 3c5c59f71643b7b605fc390066042d145925e158..38d19081555743af91f234751341222687fcab98 100644
--- a/ui/views/controls/textfield/native_textfield_win.h
+++ b/ui/views/controls/textfield/native_textfield_win.h
@@ -56,12 +56,6 @@ class NativeTextfieldWin
                                          const POINT& current,
                                          DWORD elapsed_time);
 
-  // Returns true if the virtual key code is a digit coming from the numeric
-  // keypad (with or without NumLock on).  |extended_key| should be set to the
-  // extended key flag specified in the WM_KEYDOWN/UP where the |key_code|
-  // originated.
-  VIEWS_EXPORT static bool IsNumPadDigit(int key_code, bool extended_key);
-
   // See the code in textfield.cc that calls this for why this is here.
   void AttachHack();