[LayoutNG] Change core/layout/ng to Chromium style and rename files.

third_party/WebKit/Source/core/layout/ng/NGText.h

-// Copyright 2016 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.
-
-#ifndef NGText_h
-#define NGText_h
-
-#include "core/CoreExport.h"
-#include "platform/LayoutUnit.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-class CORE_EXPORT NGText final {
-public:
-    NGText(LayoutUnit inlineSize, LayoutUnit blockSize);
-    ~NGText() { }
-
-    LayoutUnit inlineSize() const { return m_inlineSize; }
-    LayoutUnit blockSize() const { return m_blockSize; }
-
-    LayoutUnit inlineOffset() const { return m_inlineOffset; }
-    LayoutUnit blockOffset() const { return m_blockOffset; }
-
-    const String text() const { return String(); }
-
-    void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
-
-private:
-    LayoutUnit m_inlineSize;
-    LayoutUnit m_blockSize;
-
-    LayoutUnit m_inlineOffset;
-    LayoutUnit m_blockOffset;
-};
-
-} // namespace blink
-
-#endif // NGText_h