Fix some warnings in Eclipse

java/org/chromium/distiller/extractors/embeds/TwitterExtractor.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.extractors.embeds;
 
 import org.chromium.distiller.DomUtil;
 import org.chromium.distiller.LogUtil;
 import org.chromium.distiller.webdocument.WebEmbed;
 
 import com.google.gwt.dom.client.AnchorElement;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
 import com.google.gwt.dom.client.IFrameElement;
 import com.google.gwt.dom.client.NodeList;
 
-import java.util.HashMap;
 import java.util.HashSet;
-import java.util.Map;
 import java.util.Set;
 
 /**
  * TwitterExtractor is used to look for Twitter embeds. This class looks for both rendered and
  * unrendered tweets since distillation may happen before or after that particular javascript runs.
  */
 public class TwitterExtractor implements EmbedExtractor {
 
     private static final Set<String> relevantTags = new HashSet<>();
     static {
@@ skipping 109 matching lines @@
 
         String id = tweetBlock.getAttribute("data-tweet-id");
 
         if (id.isEmpty()) {
             return null;
         }
 
         return new WebEmbed(e, "twitter", id, null);
     }
 }