Add more missing closing namespace comments.

third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp

 //
 // 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.
 //
 
 #include "core/inspector/InspectorTracingAgent.h"
 
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/IdentifiersFactory.h"
@@ skipping 73 matching lines @@
 {
     resetSessionId();
 }
 
 void InspectorTracingAgent::resetSessionId()
 {
     m_state->remove(TracingAgentState::sessionId);
     m_workerAgent->setTracingSessionId(sessionId());
 }
 
-}
+} // namespace blink