Remove DartDocumentationGenerator and related flags.

compiler/java/com/google/dart/compiler/backend/doc/ElementNameComparator.java

Index: compiler/java/com/google/dart/compiler/backend/doc/ElementNameComparator.java
diff --git a/compiler/java/com/google/dart/compiler/backend/doc/ElementNameComparator.java b/compiler/java/com/google/dart/compiler/backend/doc/ElementNameComparator.java
deleted file mode 100644
index 09ca2e68e2f5496d58867a38b25fa9ed3f9bfc6f..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/doc/ElementNameComparator.java
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-package com.google.dart.compiler.backend.doc;
-
-import com.google.dart.compiler.resolver.Element;
-
-import java.util.Comparator;
-
-class ElementNameComparator implements Comparator<Element> {
-  @Override
-  public int compare(Element e1, Element e2) {
-    String name1 = e1.getName();
-    String name2 = e2.getName();
-    return name1.compareTo(name2);
-  }
-}