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

content/public/android/java/src/org/chromium/content_public/common/Referrer.java

 // Copyright 2014 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.content_public;
+package org.chromium.content_public.common;
 
 /**
  * Container that holds together a referrer URL along with the referrer policy set on the
  * originating frame. This corresponds to native content/public/common/referrer.h.
  */
 public class Referrer {
     private final String mUrl;
     private final int mPolicy;
 
     public Referrer(String url, int policy) {
         mUrl = url;
         mPolicy = policy;
     }
 
     public String getUrl() {
         return mUrl;
     }
 
     public int getPolicy() {
         return mPolicy;
     }
 }