Revert 3f2e575 and f7a3817

The fix for #444 turns out to cause issues with frozen strings
(see #1077). Furthermore, MRI as of this commit behaves similar to
JRuby, i.e. it adds the extra newline at the end of the fragment.

ext/java/nokogiri/XmlDocumentFragment.java

@@ -54,7 +54,6 @@
 import org.jruby.runtime.ThreadContext;
 import org.jruby.runtime.builtin.IRubyObject;
 import org.w3c.dom.Attr;
-import org.w3c.dom.Document;
 import org.w3c.dom.NamedNodeMap;
 
 /**
@@ -90,7 +89,6 @@ public static IRubyObject rbNew(ThreadContext context, IRubyObject cls, IRubyObj
 
         // make wellformed fragment, ignore invalid namespace, or add appropriate namespace to parse
         if (args.length > 1 && args[1] instanceof RubyString) {
-            args[1] = trim(context, doc, (RubyString)args[1]);
             if (XmlDocumentFragment.isTag((RubyString)args[1])) {
                 args[1] = RubyString.newString(context.getRuntime(), addNamespaceDeclIfNeeded(doc, rubyStringToString(args[1])));
             }
@@ -107,18 +105,6 @@ public static IRubyObject rbNew(ThreadContext context, IRubyObject cls, IRubyObj
         RuntimeHelpers.invoke(context, fragment, "initialize", args);
         return fragment;
     }
-
-    private static IRubyObject trim(ThreadContext context, XmlDocument xmlDocument, RubyString str) {
-        // checks whether schema is given. if exists, allows whitespace processing to a parser
-        Document document = (Document)xmlDocument.node;
-        if (document.getDoctype() != null) return str;
-        // strips trailing \n off forcefully
-        // not to return new object in case of no chomp needed, chomp! is used here.
-        IRubyObject result;
-        if (context.getRuntime().is1_9()) result = str.chomp19(context);
-        else result = str.chomp_bang(context);
-        return result.isNil() ? str : result;
-    }
 
     private static boolean isTag(RubyString ruby_string) {
         String str = rubyStringToString(ruby_string);

test/html/test_document_fragment.rb

@@ -296,11 +296,6 @@ def test_capturing_nonparse_errors_during_node_copy_between_fragments
         assert_equal original_errors1, frag1.errors
         assert_equal original_errors2, frag2.errors
       end
-
-      def test_issue_444_trim_when_no_schem_given
-        fragment = Nokogiri::HTML::DocumentFragment.parse("<p>hi</p>\n").to_html
-        assert_equal "<p>hi</p>", fragment
-      end
     end
   end
 end