Use stricter comment-detecting heuristics

javatests/org/chromium/distiller/webdocument/ElementActionTest.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.distiller.webdocument;
 
 import org.chromium.distiller.DomDistillerJsTestCase;
 import org.chromium.distiller.DomUtil;
 import org.chromium.distiller.labels.DefaultLabels;
 
@@ skipping 90 matching lines @@
         bodyElement.setClassName("comment");
         assertFalse(hasLabel(ElementAction.getForElement(bodyElement),
                 DefaultLabels.STRICTLY_NOT_CONTENT));
 
         assertTrue(hasLabel(getForHtml("<div class=\" comment \"></div>"),
                     DefaultLabels.STRICTLY_NOT_CONTENT));
         assertTrue(hasLabel(getForHtml("<div class=\"foo.1 comment-thing\"></div>"),
                     DefaultLabels.STRICTLY_NOT_CONTENT));
         assertTrue(hasLabel(getForHtml("<div id=\"comments\"></div>"),
                     DefaultLabels.STRICTLY_NOT_CONTENT));
+        assertTrue(hasLabel(getForHtml("<div class=\"user-comments\"></div>"),
+                    DefaultLabels.STRICTLY_NOT_CONTENT));
 
-        assertTrue(hasLabel(getForHtml("<div class=\"user-comments\"></div>"),
+        assertFalse(hasLabel(getForHtml("<article class=\"user-comments\"></div>"),
                     DefaultLabels.STRICTLY_NOT_CONTENT));
 
         /**
          * Element.getClassName() returns SVGAnimatedString for SvgElement
          * https://code.google.com/p/google-web-toolkit/issues/detail?id=9195
          */
         assertFalse(hasLabel(getForHtml("<svg></svg>"), DefaultLabels.STRICTLY_NOT_CONTENT));
 
         assertFalse(hasLabel(getForHtml(
                 "<div class=\"user-comments another-class lots-of-classes too-many-classes" +
                              "class1 class2 class3 class4 class5 class6 class7 class8\"></div>"),
                 DefaultLabels.STRICTLY_NOT_CONTENT));
         assertTrue(hasLabel(getForHtml(
-                "<div class=\"     user-comments                         a       b   \"></div>"),
+                "<div class=\"     user-comments                         a          \"></div>"),
                 DefaultLabels.STRICTLY_NOT_CONTENT));
     }
 }