Fix some warnings in Eclipse

java/org/chromium/distiller/TreeCloneBuilder.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.distiller;
 
 import com.google.gwt.dom.client.Element;
 import com.google.gwt.dom.client.Node;
 
-import java.util.ArrayList;
 import java.util.List;
 
 /**
  * This provides a way to extract the minimal part of the DOM tree that contains the provided list
  * of leaf nodes (the result is still a tree). This is a faster method of generating output than
  * the NodeListExpander.
  */
 public class TreeCloneBuilder {
     /**
      * Clone the provided node and attempt to specify text directionality ("dir" attribute).
@@ skipping 68 matching lines @@
                 n = n.getParentNode();
                 clone = cloneParent(clone, n);
             }
         }
         while (clone.getParentNode() != null) {
             clone = clone.getParentNode();
         }
         return clone;
     }
 }