Support Holo Light theme for wifi during setup

Adds programmatic support for holo light theme, activated by setting
EXTRA_THEME to "holo_light". Light-themed graphics are still pending.

Bug: 10407819
Change-Id: I81b6bf3fdf7ca3ee72b0f921b8adf6d858415887

src/com/android/settings/wifi/WifiDialog.java

@@ -38,7 +38,7 @@ class WifiDialog extends AlertDialog implements WifiConfigUiBase {
 
     public WifiDialog(Context context, DialogInterface.OnClickListener listener,
             AccessPoint accessPoint, boolean edit) {
-        super(context, R.style.Theme_WifiDialog);
+        super(context);
         mEdit = edit;
         mListener = listener;
         mAccessPoint = accessPoint;