Oilpan: fix build after r188594.

Source/core/events/TreeScopeEventContext.cpp

Index: Source/core/events/TreeScopeEventContext.cpp
diff --git a/Source/core/events/TreeScopeEventContext.cpp b/Source/core/events/TreeScopeEventContext.cpp
index 4966a59af18493c85b0b8efc93f02496f7b469b2..79ad61ba45eea2ed3218bbeaf5038310a5bce6cb 100644
--- a/Source/core/events/TreeScopeEventContext.cpp
+++ b/Source/core/events/TreeScopeEventContext.cpp
@@ -34,12 +34,12 @@
 
 namespace blink {
 
-WillBeHeapVector<RefPtrWillBeRawPtr<EventTarget>>& TreeScopeEventContext::ensureEventPath(EventPath& path)
+WillBeHeapVector<RefPtrWillBeMember<EventTarget>>& TreeScopeEventContext::ensureEventPath(EventPath& path)
 {
     if (m_eventPath)
         return *m_eventPath;
 
-    m_eventPath = adoptPtrWillBeNoop(new WillBeHeapVector<RefPtrWillBeRawPtr<EventTarget>>());
+    m_eventPath = adoptPtrWillBeNoop(new WillBeHeapVector<RefPtrWillBeMember<EventTarget>>());
     LocalDOMWindow* window = path.windowEventContext().window();
     m_eventPath->reserveCapacity(path.size() + window ? 1 : 0);
     for (size_t i = 0; i < path.size(); ++i) {