Update a comment and fix a possible crash in HTMLSelectElement::setRecalcListItems.

third_party/WebKit/Source/core/html/HTMLSelectElementTest.cpp

 // 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.
 
 #include "core/html/HTMLSelectElement.h"
 
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLFormElement.h"
 #include "core/html/forms/FormController.h"
@@ skipping 323 matching lines @@
     EXPECT_EQ(String(), select->defaultToolTip()) << "defaultToolTip for SELECT with FORM[novalidate] and required attribute should return null string.";
     EXPECT_EQ(select->defaultToolTip(), option->defaultToolTip());
     EXPECT_EQ(select->defaultToolTip(), optgroup->defaultToolTip());
 
     option->remove();
     optgroup->remove();
     EXPECT_EQ(String(), option->defaultToolTip());
     EXPECT_EQ(String(), optgroup->defaultToolTip());
 }
 
+TEST_F(HTMLSelectElementTest, SetRecalcListItemsByOptgroupRemoval)
+{
+    document().documentElement()->setInnerHTML("<select><optgroup><option>sub1</option><option>sub2</option></optgroup></select>", ASSERT_NO_EXCEPTION);
+    document().view()->updateAllLifecyclePhases();
+    HTMLSelectElement* select = toHTMLSelectElement(document().body()->firstChild());
+    select->setInnerHTML("", ASSERT_NO_EXCEPTION);
+    // PASS if setInnerHTML didn't have a check failure.
+}
+
 } // namespace blink