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

Source/core/editing/InputMethodControllerTest.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/editing/InputMethodController.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/Range.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class InputMethodControllerTest : public ::testing::Test {
 protected:
     InputMethodController& controller() { return frame().inputMethodController(); }
     HTMLDocument& document() const { return *m_document; }
     LocalFrame& frame() const { return m_dummyPageHolder->frame(); }
     Element* insertHTMLElement(const char* elementCode, const char* elementId);
 
 private:
-    virtual void SetUp() override;
+    void SetUp() override;
 
     OwnPtr<DummyPageHolder> m_dummyPageHolder;
     HTMLDocument* m_document;
 };
 
 void InputMethodControllerTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
     m_document = toHTMLDocument(&m_dummyPageHolder->document());
     ASSERT(m_document);
@@ skipping 93 matching lines @@
 {
     insertHTMLElement("<div id='sample' contenteditable='true'>test</div>", "sample");
 
     Vector<CompositionUnderline> underlines;
     underlines.append(CompositionUnderline(7, 8, Color(255, 0, 0), false, 0));
     controller().setCompositionFromExistingText(underlines, 7, 8);
 
     EXPECT_FALSE(controller().compositionRange());
 }
 
-} // namespace
+} // namespace blink