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

Source/core/layout/MultiColumnFragmentainerGroup.h

Index: Source/core/layout/MultiColumnFragmentainerGroup.h
diff --git a/Source/core/layout/MultiColumnFragmentainerGroup.h b/Source/core/layout/MultiColumnFragmentainerGroup.h
index 2c64712fb7fc1dbcaa5428108f81c0f2cd5114fe..1de413e3a119849b4057522e31373473a9eb0741 100644
--- a/Source/core/layout/MultiColumnFragmentainerGroup.h
+++ b/Source/core/layout/MultiColumnFragmentainerGroup.h
@@ -6,6 +6,7 @@
 #define MultiColumnFragmentainerGroup_h
 
 #include "core/layout/LayoutMultiColumnFlowThread.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
@@ -26,6 +27,7 @@ namespace blink {
 // need more columns than what a group has room for, we'll create another group and put them there
 // (and make them appear in the next outer fragmentainer).
 class MultiColumnFragmentainerGroup {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     MultiColumnFragmentainerGroup(LayoutMultiColumnSet&);
 
@@ -156,6 +158,7 @@ private:
 // group. Deleting the one group is not allowed (or possible). There will be more than one group if
 // the owning column set lives in multiple outer fragmentainers (e.g. multicol inside paged media).
 class CORE_EXPORT MultiColumnFragmentainerGroupList {
+    DISALLOW_ALLOCATION();
 public:
     MultiColumnFragmentainerGroupList(LayoutMultiColumnSet&);
     ~MultiColumnFragmentainerGroupList();