Remove no-op handlePerferenceTreeClick from PrefControllers

Bug: 33429853
Test: RunSettingsRoboTests
Change-Id: I5633953e3d7b07f9006e541b96a24a2a769e2686

src/com/android/settings/notification/ZenModePreferenceController.java

@@ -17,7 +17,6 @@
 package com.android.settings.notification;
 
 import android.content.Context;
-import android.support.v7.preference.Preference;
 
 public class ZenModePreferenceController extends AdjustVolumeRestrictedPreferenceController {
 
@@ -27,11 +26,6 @@ public class ZenModePreferenceController extends AdjustVolumeRestrictedPreferenc
         super(context);
     }
 
-    @Override
-    public boolean handlePreferenceTreeClick(Preference preference) {
-        return false;
-    }
-
     @Override
     public String getPreferenceKey() {
         return KEY_ZEN_MODE;