Hide "Clear frequents" setting instead of just disabling it

Change-Id: I9d9a4ecd958c1a1d83906388bb1cc25339278011
diff --git a/src/com/android/dialer/DialtactsActivity.java b/src/com/android/dialer/DialtactsActivity.java
index c9c94fa..9946297 100644
--- a/src/com/android/dialer/DialtactsActivity.java
+++ b/src/com/android/dialer/DialtactsActivity.java
@@ -368,7 +368,7 @@
                 final Menu menu = popupMenu.getMenu();
                 popupMenu.inflate(R.menu.dialtacts_options);
                 final MenuItem clearFrequents = menu.findItem(R.id.menu_clear_frequents);
-                clearFrequents.setEnabled(mPhoneFavoriteFragment.hasFrequents());
+                clearFrequents.setVisible(mPhoneFavoriteFragment.hasFrequents());
                 popupMenu.setOnMenuItemClickListener(this);
                 popupMenu.show();
                 break;