class PerformanceEntry;
typedef unsigned long long (PerformanceTiming::*NavigationTimingFunction)() const;
-typedef WillBeHeapHashMap<String, PerformanceEntryVector> PerformanceEntryMap;
+using PerformanceEntryMap = WillBeHeapHashMap<String, PerformanceEntryVector>;
class UserTiming : public RefCountedWillBeGarbageCollected<UserTiming> {
public: