Consistently use on-heap collections for StyleRuleBase descendants.

Source/heap/Heap.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1304 matching lines @@
 
 template<typename T, size_t inlineCapacity = 0>
 class HeapVector : public Vector<T, inlineCapacity, HeapAllocator> {
 public:
     HeapVector() { }
 
     explicit HeapVector(size_t size) : Vector<T, inlineCapacity, HeapAllocator>(size)
     {
     }
 
+    HeapVector(size_t size, const T& val) : Vector<T, inlineCapacity, HeapAllocator>(size, val)
+    {
+    }
+
     template<size_t otherCapacity>
     HeapVector(const HeapVector<T, otherCapacity>& other)
         : Vector<T, inlineCapacity, HeapAllocator>(other)
     {
     }
 
     template<typename U>
     void append(const U& other)
     {
         Vector<T, inlineCapacity, HeapAllocator>::append(other);
@@ skipping 354 matching lines @@
 // to export. This forces it to export all the methods from ThreadHeap.
 template<> void ThreadHeap<FinalizedHeapObjectHeader>::addPageToHeap(const GCInfo*);
 template<> void ThreadHeap<HeapObjectHeader>::addPageToHeap(const GCInfo*);
 extern template class HEAP_EXPORT ThreadHeap<FinalizedHeapObjectHeader>;
 extern template class HEAP_EXPORT ThreadHeap<HeapObjectHeader>;
 #endif
 
 }
 
 #endif // Heap_h