Only use devtools category for devtools instrumentation trace events

Source/core/inspector/TraceEventDispatcher.cpp

Index: Source/core/inspector/TraceEventDispatcher.cpp
diff --git a/Source/core/inspector/TraceEventDispatcher.cpp b/Source/core/inspector/TraceEventDispatcher.cpp
index 8351b81f534455989038fa4f7070b2cb9ac62da6..dec9a8e12d9162c9576abc205d769c1e8638fcbd 100644
--- a/Source/core/inspector/TraceEventDispatcher.cpp
+++ b/Source/core/inspector/TraceEventDispatcher.cpp
@@ -100,7 +100,7 @@ void TraceEventDispatcher::processBackgroundEvents()
 
 void TraceEventDispatcher::innerAddListener(const char* name, char phase, TraceEventTargetBase* instance, TraceEventHandlerMethod method, InspectorClient* client)
 {
-    static const char CategoryFilter[] = "devtools,webkit";
+    static const char CategoryFilter[] = "devtools";
 
     ASSERT(isMainThread());
     MutexLocker locker(m_mutex);