Fix unit test style in core/{dom,editing,html}/.

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 "config.h"
 #include "core/html/HTMLSelectElement.h"
 
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/forms/FormController.h"
 #include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class HTMLSelectElementTest : public::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
     HTMLDocument& document() const { return *m_document; }
 
 private:
     OwnPtr<DummyPageHolder> m_dummyPageHolder;
     RefPtrWillBePersistent<HTMLDocument> m_document;
 };
 
 void HTMLSelectElementTest::SetUp()
 {
     Page::PageClients pageClients;
@@ skipping 65 matching lines @@
     ASSERT_FALSE(opt3->selected());
 
     // Restore
     select->restoreFormControlState(selectState);
     EXPECT_FALSE(opt0->selected());
     EXPECT_TRUE(opt2->selected());
     EXPECT_TRUE(opt3->selected());
 }
 
 } // namespace blink