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

Source/core/html/HTMLTextFormControlElementTest.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/HTMLTextFormControlElement.h"
 
 #include "core/dom/Position.h"
 #include "core/dom/Text.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/SpellChecker.h"
 #include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLBRElement.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "core/layout/LayoutTreeAsText.h"
 #include "core/loader/EmptyClients.h"
 #include "core/page/SpellCheckerClient.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "wtf/OwnPtr.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class HTMLTextFormControlElementTest : public ::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
 
     DummyPageHolder& page() const { return *m_dummyPageHolder; }
     HTMLDocument& document() const { return *m_document; }
     HTMLTextFormControlElement& textControl() const { return *m_textControl; }
     HTMLInputElement& input() const { return *m_input; }
 
     int layoutCount() const { return page().frameView().layoutCount(); }
     void forceLayoutFlag();
 
 private:
@@ skipping 174 matching lines @@
     document().frame()->selection().setSelection(newSelection, FrameSelection::CloseTyping | FrameSelection::ClearTypingStyle | FrameSelection::DoNotUpdateAppearance);
     ASSERT_EQ(3, input->selectionStart());
 
     OwnPtrWillBePersistent<SpellChecker> spellChecker(SpellChecker::create(page().frame()));
     forceLayoutFlag();
     int startCount = layoutCount();
     spellChecker->respondToChangedSelection(oldSelection, FrameSelection::CloseTyping | FrameSelection::ClearTypingStyle);
     EXPECT_EQ(startCount, layoutCount());
 }
 
-}
+} // namespace blink