DevTools: clear session id. follow-up patch after r183608

Source/core/inspector/InspectorTracingAgent.cpp

Index: Source/core/inspector/InspectorTracingAgent.cpp
diff --git a/Source/core/inspector/InspectorTracingAgent.cpp b/Source/core/inspector/InspectorTracingAgent.cpp
index 8e8edac01e7a874a5244db6f0744005010bf7627..a2fdd9880675c759791311b9c23f1c3ed8dbe27f 100644
--- a/Source/core/inspector/InspectorTracingAgent.cpp
+++ b/Source/core/inspector/InspectorTracingAgent.cpp
@@ -40,6 +40,7 @@ void InspectorTracingAgent::restore()
 
 void InspectorTracingAgent::start(ErrorString*, const String& categoryFilter, const String&, const double*, PassRefPtrWillBeRawPtr<StartCallback> callback)
 {
+    ASSERT(m_state->getString(TracingAgentState::sessionId) == String());

[aandrey, 2014/10/16 15:38:22]

isEmpty()

[loislo, 2014/10/17 06:23:21]

Done.

     m_state->setString(TracingAgentState::sessionId, IdentifiersFactory::createIdentifier());
     m_client->enableTracing(categoryFilter);
     emitMetadataEvents();
@@ -77,4 +78,9 @@ void InspectorTracingAgent::setFrontend(InspectorFrontend* frontend)
     m_frontend = frontend->tracing();
 }
 
+void InspectorTracingAgent::clearFrontend()
+{
+    m_state->setString(TracingAgentState::sessionId, String());

[aandrey, 2014/10/16 15:38:22]

m_state->remove()

[loislo, 2014/10/17 06:23:21]

Done.

+}
+
 }