Fix master build. WirelessSettings is a fragment in master.

Change-Id: I9ad1104605558859d90dd1ecc083e9ef35bf3fa0

src/com/android/settings/WirelessSettings.java

@@ -127,7 +127,7 @@ public class WirelessSettings extends SettingsPreferenceFragment {
         }
 
         // Remove NFC if its not available
-        if (NfcAdapter.getDefaultAdapter(this) == null) {
+        if (NfcAdapter.getDefaultAdapter(activity) == null) {
             getPreferenceScreen().removePreference(nfc);
         }