Add more missing closing namespace comments.

third_party/WebKit/Source/platform/graphics/PicturePattern.h

 // 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.
 
 #ifndef PicturePattern_h
 #define PicturePattern_h
 
 #include "platform/graphics/Pattern.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT PicturePattern final : public Pattern {
 public:
     static PassRefPtr<PicturePattern> create(PassRefPtr<const SkPicture>, RepeatMode);
 
     ~PicturePattern() override;
 
 protected:
     PassRefPtr<SkShader> createShader() override;
 
 private:
     PicturePattern(PassRefPtr<const SkPicture>, RepeatMode);
 
     RefPtr<const SkPicture> m_tilePicture;
 };
 
-} // namespace
+} // namespace blink
 
 #endif