Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp

Index: third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
index 6e8becc9192f1ccc4ecfb86645254a3f3455f048..aa4b8dce3eabac517c1347b970e627a96c7c0061 100644
--- a/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleSheetCollection.cpp
@@ -34,15 +34,13 @@ StyleSheetCollection::StyleSheetCollection()
 {
 }
 
-DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(StyleSheetCollection);
-
 void StyleSheetCollection::swap(StyleSheetCollection& other)
 {
     m_styleSheetsForStyleSheetList.swap(other.m_styleSheetsForStyleSheetList);
     m_activeAuthorStyleSheets.swap(other.m_activeAuthorStyleSheets);
 }
 
-void StyleSheetCollection::swapSheetsForSheetList(WillBeHeapVector<RefPtrWillBeMember<StyleSheet>>& sheets)
+void StyleSheetCollection::swapSheetsForSheetList(HeapVector<Member<StyleSheet>>& sheets)
 {
     // Only called for collection of HTML Imports that never has active sheets.
     ASSERT(m_activeAuthorStyleSheets.isEmpty());