Make classes and structures in core/dom fast-allocated.

Source/core/dom/AttributeCollection.h

Index: Source/core/dom/AttributeCollection.h
diff --git a/Source/core/dom/AttributeCollection.h b/Source/core/dom/AttributeCollection.h
index 9ea2ca08a696999fd56b20c62e7689554338a4ca..467661eea7c0193783b4b580a923148b53f08afd 100644
--- a/Source/core/dom/AttributeCollection.h
+++ b/Source/core/dom/AttributeCollection.h
@@ -35,12 +35,14 @@
 
 #include "core/dom/Attr.h"
 #include "core/dom/Attribute.h"
+#include "wtf/Allocator.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 template <typename Container, typename ContainerMemberType = Container>
 class AttributeCollectionGeneric {
+    STACK_ALLOCATED();
 public:
     using ValueType = typename Container::ValueType;
     using iterator = ValueType*;
@@ -75,6 +77,7 @@ protected:
 };
 
 class AttributeArray {
+    DISALLOW_ALLOCATION();
 public:
     using ValueType = const Attribute;