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

Source/core/dom/DocumentMarkerControllerTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "core/dom/Range.h"
 #include "core/dom/RenderedDocumentMarker.h"
 #include "core/dom/Text.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/testing/WTFTestHelpers.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class DocumentMarkerControllerTest : public ::testing::Test {
 protected:
-    virtual void SetUp() override;
+    void SetUp() override;
 
     Document& document() const { return *m_document; }
     DocumentMarkerController& markerController() const { return m_document->markers(); }
 
     PassRefPtrWillBeRawPtr<Text> createTextNode(const char*);
     void markNodeContents(PassRefPtrWillBeRawPtr<Node>);
     void setBodyInnerHTML(const char*);
 
 private:
     OwnPtr<DummyPageHolder> m_dummyPageHolder;
@@ skipping 149 matching lines @@
     EXPECT_EQ(1u, renderedRects.size());
     EXPECT_NE(invalidRect, renderedRects[0]);
 
     div->setAttribute(HTMLNames::styleAttr, "margin: 200px");
     document().updateLayout();
     Vector<IntRect> newRenderedRects = markerController().renderedRectsForMarkers(DocumentMarker::Spelling);
     EXPECT_EQ(1u, newRenderedRects.size());
     EXPECT_NE(renderedRects[0], newRenderedRects[0]);
 }
 
-}
+} // namespace blink