Support UseCounter in dedicated workers.

Source/core/workers/WorkerGlobalScope.cpp

Index: Source/core/workers/WorkerGlobalScope.cpp
diff --git a/Source/core/workers/WorkerGlobalScope.cpp b/Source/core/workers/WorkerGlobalScope.cpp
index 262da1c6d83586d479ef705717be7fbfcd8edc8e..e2ca28d8c93c477e87a4df37a66e4c5fc00c3869 100644
--- a/Source/core/workers/WorkerGlobalScope.cpp
+++ b/Source/core/workers/WorkerGlobalScope.cpp
@@ -322,6 +322,16 @@ WorkerEventQueue* WorkerGlobalScope::eventQueue() const
     return m_eventQueue.get();
 }
 
+void WorkerGlobalScope::countFeature(UseCounter::Feature) const
+{
+    // FIXME: How should we count features for shared/service workers?
+}
+
+void WorkerGlobalScope::countDeprecation(UseCounter::Feature) const
+{
+    // FIXME: How should we count features for shared/service workers?
+}
+
 void WorkerGlobalScope::trace(Visitor* visitor)
 {
     visitor->trace(m_console);