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

Source/core/frame/LayoutSubtreeRootList.h

Index: Source/core/frame/LayoutSubtreeRootList.h
diff --git a/Source/core/frame/LayoutSubtreeRootList.h b/Source/core/frame/LayoutSubtreeRootList.h
index 4ae8bf2a425bdd23c97c807492c1616b94be987d..e7f79c9a59d3c96997d7b4eaa876e59b9103ff93 100644
--- a/Source/core/frame/LayoutSubtreeRootList.h
+++ b/Source/core/frame/LayoutSubtreeRootList.h
@@ -5,6 +5,7 @@
 #ifndef LayoutSubtreeRootList_h
 #define LayoutSubtreeRootList_h
 
+#include "wtf/Allocator.h"
 #include "wtf/HashSet.h"
 #include "wtf/Vector.h"
 
@@ -27,6 +28,7 @@ class LayoutObject;
 // TODO(leviw): This should really be something akin to a LayoutController
 // that FrameView delegates layout work to.
 class LayoutSubtreeRootList {
+    DISALLOW_ALLOCATION();
 public:
     LayoutSubtreeRootList()
     { }