Remove non-elderberry herb flavors.

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarLayout.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.toolbar;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.annotation.SuppressLint;
@@ skipping 766 matching lines @@
      */
     protected void setMenuButtonContentDescription(boolean isUpdateBadgeVisible) {
         if (isUpdateBadgeVisible) {
             mMenuButton.setContentDescription(getResources().getString(
                     R.string.accessibility_toolbar_btn_menu_update));
         } else {
             mMenuButton.setContentDescription(getResources().getString(
                     R.string.accessibility_toolbar_btn_menu));
         }
     }
-
-    @Override
-    public void setReturnButtonListener(View.OnClickListener listener) {
-    }
 }