Simplify LifecycleNotifier and Observer.

third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp

Index: third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp
diff --git a/third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp b/third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp
index 0a623e14eeec35e3bcf42fb77020ca67174524e2..5a6db288139154bf8776f1ed6e4788cff857a99b 100644
--- a/third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp
+++ b/third_party/WebKit/Source/core/page/PageLifecycleNotifier.cpp
@@ -33,43 +33,15 @@ namespace blink {
 void PageLifecycleNotifier::notifyPageVisibilityChanged()
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-#if !ENABLE(OILPAN)
-    // Notifications perform unknown amounts of heap allocations,
-    // which might trigger (conservative) GCs. This will flush out
-    // dead observers, causing the _non-heap_ set be updated. Snapshot
-    // the observers and explicitly check if they're still alive before
-    // notifying.
-    Vector<RawPtr<PageLifecycleObserver>> snapshotOfObservers;
-    copyToVector(m_observers, snapshotOfObservers);
-    for (PageLifecycleObserver* observer : snapshotOfObservers) {
-        if (m_observers.contains(observer))
-            observer->pageVisibilityChanged();
-    }
-#else
     for (PageLifecycleObserver* observer : m_observers)
         observer->pageVisibilityChanged();
-#endif
 }
 
 void PageLifecycleNotifier::notifyDidCommitLoad(LocalFrame* frame)
 {
     TemporaryChange<IterationType> scope(m_iterating, IteratingOverAll);
-#if !ENABLE(OILPAN)
-    // Notifications perform unknown amounts of heap allocations,
-    // which might trigger (conservative) GCs. This will flush out
-    // dead observers, causing the _non-heap_ set be updated. Snapshot
-    // the observers and explicitly check if they're still alive before
-    // notifying.
-    Vector<RawPtr<PageLifecycleObserver>> snapshotOfObservers;
-    copyToVector(m_observers, snapshotOfObservers);
-    for (PageLifecycleObserver* observer : snapshotOfObservers) {
-        if (m_observers.contains(observer))
-            observer->didCommitLoad(frame);
-    }
-#else
     for (PageLifecycleObserver* observer : m_observers)
         observer->didCommitLoad(frame);
-#endif
 }
 
 } // namespace blink