Remove logic for adding a search icon to action bar.

No longer used given that we don't show the search icon on any page.
The main settings page now has the search bar.

Change-Id: I9535028298739467e7fa9c75d1a2fb2b2fa3251b
Fixes: 62230804
Bug: 37477506
Test: robotests

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

@@ -61,7 +61,6 @@ public class ConfigureWifiSettings extends DashboardFragment {
         super.onAttach(context);
         mProgressiveDisclosureMixin.setTileLimit(
             mUseOpenWifiPreferenceController.isAvailable() ? 3 : 2);
-        ((SettingsActivity) getActivity()).setDisplaySearchMenu(true);
     }
 
     @Override