Implement navigator.hardwareConcurrency

Source/core/workers/WorkerNavigator.h

Index: Source/core/workers/WorkerNavigator.h
diff --git a/Source/core/workers/WorkerNavigator.h b/Source/core/workers/WorkerNavigator.h
index 89f72a220e4a15372828f436b08ad3b79cd2af21..0750e8fff7a9f7d3b9a227f123774f2afa31d8e8 100644
--- a/Source/core/workers/WorkerNavigator.h
+++ b/Source/core/workers/WorkerNavigator.h
@@ -27,6 +27,7 @@
 #define WorkerNavigator_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "core/frame/NavigatorCPU.h"
 #include "core/frame/NavigatorID.h"
 #include "core/frame/NavigatorOnLine.h"
 #include "platform/Supplementable.h"
@@ -37,7 +38,7 @@
 
 namespace WebCore {
 
-class WorkerNavigator FINAL : public RefCountedWillBeGarbageCollectedFinalized<WorkerNavigator>, public ScriptWrappable, public NavigatorID, public NavigatorOnLine, public WillBeHeapSupplementable<WorkerNavigator> {
+class WorkerNavigator FINAL : public RefCountedWillBeGarbageCollectedFinalized<WorkerNavigator>, public ScriptWrappable, public NavigatorCPU, public NavigatorID, public NavigatorOnLine, public WillBeHeapSupplementable<WorkerNavigator> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkerNavigator);
 public:
     static PassRefPtrWillBeRawPtr<WorkerNavigator> create(const String& userAgent)