Cleanup namespace usage in Source/core/platform/[A-Z]*.h

Source/platform/TraceLocation.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 TraceLocation_h
 #define TraceLocation_h
 
 // This is intentionally similar to base/location.h
 // that we could easily replace usage of TraceLocation
 // with base::Location after merging into Chromium.
@@ skipping 16 matching lines @@
 
     const char* functionName() const { return m_functionName; }
     const char* fileName() const { return m_fileName; }
 
 private:
     const char* m_functionName;
     const char* m_fileName;
 };
 
 #define FROM_HERE ::blink::TraceLocation(__FUNCTION__, __FILE__)
-}
+} // namespace blink
 
 #endif // TraceLocation_h