[DevTools] Remove InspectorState.

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

Index: third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp
diff --git a/third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp
index 20faf58a1d7be82a36076915755e90e010cea24e..978795f93d47ccec35dc43fceff43894fc707b23 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorTracingAgent.cpp
@@ -9,7 +9,6 @@
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InspectedFrames.h"
-#include "core/inspector/InspectorState.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/inspector/InspectorWorkerAgent.h"
 #include "platform/TraceEvent.h"
@@ -47,7 +46,7 @@ void InspectorTracingAgent::restore()
 
 void InspectorTracingAgent::start(ErrorString*, const String* categoryFilter, const String*, const double*, const String*, PassRefPtrWillBeRawPtr<StartCallback> callback)
 {
-    ASSERT(m_state->getString(TracingAgentState::sessionId).isEmpty());
+    ASSERT(sessionId().isEmpty());
     m_state->setString(TracingAgentState::sessionId, IdentifiersFactory::createIdentifier());
     m_client->enableTracing(categoryFilter ? *categoryFilter : String());
     emitMetadataEvents();
@@ -63,7 +62,9 @@ void InspectorTracingAgent::end(ErrorString* errorString, PassRefPtrWillBeRawPtr
 
 String InspectorTracingAgent::sessionId()
 {
-    return m_state->getString(TracingAgentState::sessionId);
+    String result;
+    m_state->getString(TracingAgentState::sessionId, &result);
+    return result;
 }
 
 void InspectorTracingAgent::emitMetadataEvents()