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

third_party/WebKit/Source/core/layout/ng/NGFragment.cpp

-// 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.
-
-#include "core/layout/ng/NGFragment.h"
-
-namespace blink {
-
-NGFragment::NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize,
-    LayoutUnit inlineOverflow, LayoutUnit blockOverflow)
-    : m_inlineSize(inlineSize)
-    , m_blockSize(blockSize)
-    , m_inlineOverflow(inlineOverflow)
-    , m_blockOverflow(blockOverflow)
-{
-}
-
-void NGFragment::setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset)
-{
-    m_inlineOffset = inlineOffset;
-    m_blockOffset = blockOffset;
-}
-
-DEFINE_TRACE(NGFragment)
-{
-    visitor->trace(m_children);
-}
-
-} // namespace blink