Migrate WTF::LinkedHashSet/ListHashSet::add() to ::insert()

third_party/WebKit/Source/core/timing/PerformanceBase.cpp

Index: third_party/WebKit/Source/core/timing/PerformanceBase.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
index 0a1c1fb4ec7e29a7f61c86efcc49b03829af328e..23e1e3544b1878b47fe9ee3521353a90c61bd39d 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceBase.cpp
@@ -495,7 +495,7 @@ void PerformanceBase::clearMeasures(const String& measureName) {
 void PerformanceBase::registerPerformanceObserver(
     PerformanceObserver& observer) {
   m_observerFilterOptions |= observer.filterOptions();
-  m_observers.add(&observer);
+  m_observers.insert(&observer);
   updateLongTaskInstrumentation();
 }
 
@@ -537,7 +537,7 @@ void PerformanceBase::activateObserver(PerformanceObserver& observer) {
   if (m_activeObservers.isEmpty())
     m_deliverObservationsTimer.startOneShot(0, BLINK_FROM_HERE);
 
-  m_activeObservers.add(&observer);
+  m_activeObservers.insert(&observer);
 }
 
 void PerformanceBase::resumeSuspendedObservers() {
@@ -561,7 +561,7 @@ void PerformanceBase::deliverObservationsTimerFired(TimerBase*) {
   m_activeObservers.swap(observers);
   for (const auto& observer : observers) {
     if (observer->shouldBeSuspended())
-      m_suspendedObservers.add(observer);
+      m_suspendedObservers.insert(observer);
     else
       observer->deliver();
   }