Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/CSSFontSelector.cpp

Index: third_party/WebKit/Source/core/css/CSSFontSelector.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSFontSelector.cpp b/third_party/WebKit/Source/core/css/CSSFontSelector.cpp
index 7c432eba6f6e4063162d05bbc42e826aa3e7ff5b..0f428bf23c9481aecbb3788359d45361a481906a 100644
--- a/third_party/WebKit/Source/core/css/CSSFontSelector.cpp
+++ b/third_party/WebKit/Source/core/css/CSSFontSelector.cpp
@@ -81,7 +81,7 @@ void CSSFontSelector::dispatchInvalidationCallbacks()
 {
     m_fontFaceCache.incrementVersion();
 
-    WillBeHeapVector<RawPtrWillBeMember<CSSFontSelectorClient>> clients;
+    HeapVector<Member<CSSFontSelectorClient>> clients;
     copyToVector(m_clients, clients);
     for (auto& client : clients)
         client->fontsNeedUpdate(this);