Create org.chromium.content_public.common and move two classes there.

chrome/android/java/src/org/chromium/chrome/browser/contextmenu/EmptyChromeContextMenuItemDelegate.java

 // Copyright 2013 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.contextmenu;
 
-import org.chromium.content_public.Referrer;
+import org.chromium.content_public.common.Referrer;
 
 /**
  * An empty implementation of {@link ChromeContextMenuItemDelegate} to make overriding subsets of
  * the delegate methods easier.
  */
 public class EmptyChromeContextMenuItemDelegate implements ChromeContextMenuItemDelegate {
     @Override
     public boolean isIncognito() {
         return false;
     }
@@ skipping 39 matching lines @@
 
     @Override
     public void onSearchByImageInNewTab() {
     }
 
     @Override
     public String getPageUrl() {
         return "";
     }
 }