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

Source/core/dom/RangeTest.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/dom/Range.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeList.h"
 #include "core/dom/Text.h"
 #include "core/html/HTMLBodyElement.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLHtmlElement.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Compiler.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicString.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class RangeTest : public ::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
 
     HTMLDocument& document() const;
 
 private:
     RefPtrWillBePersistent<HTMLDocument> m_document;
 };
 
 void RangeTest::SetUp()
 {
     m_document = HTMLDocument::create();
@@ skipping 95 matching lines @@
     EXPECT_EQ(innerRight, rangeInnerRight->endContainer());
     EXPECT_EQ(1, rangeInnerRight->endOffset());
 
     EXPECT_TRUE(rangeFromTextToMiddleOfElement->boundaryPointsValid());
     EXPECT_EQ(newText, rangeFromTextToMiddleOfElement->startContainer());
     EXPECT_EQ(3, rangeFromTextToMiddleOfElement->startOffset());
     EXPECT_EQ(outer, rangeFromTextToMiddleOfElement->endContainer());
     EXPECT_EQ(4, rangeFromTextToMiddleOfElement->endOffset());
 }
 
-}
+} // namespace blink