Add more missing closing namespace comments.

third_party/WebKit/Source/core/css/FontStyleMatcher.h

 // Copyright 2015 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 FontStyleMatcher_h
 #define FontStyleMatcher_h
 
 #include "platform/fonts/FontTraits.h"
 
 namespace blink {
 
 class CSSSegmentedFontFace;
 
 class FontStyleMatcher final {
 public:
     explicit FontStyleMatcher(const FontTraits& fontTraits) : m_fontTraits(fontTraits) {};
     bool isCandidateBetter(CSSSegmentedFontFace* candidate, CSSSegmentedFontFace* current);
 
 private:
     FontStyleMatcher();
     const FontTraits& m_fontTraits;
 };
 
-}
+} // namespace blink
 
 #endif