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

Source/core/editing/GranularityStrategy.h

Index: Source/core/editing/GranularityStrategy.h
diff --git a/Source/core/editing/GranularityStrategy.h b/Source/core/editing/GranularityStrategy.h
index f77bbe3f4f55923f461b1e3d5cd0c9190afedef3..4e8fbcf8c7643c695d27ae637ed21115c3e4e31f 100644
--- a/Source/core/editing/GranularityStrategy.h
+++ b/Source/core/editing/GranularityStrategy.h
@@ -7,10 +7,12 @@
 
 #include "core/editing/SelectionStrategy.h"
 #include "core/editing/VisibleSelection.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class GranularityStrategy {
+    WTF_MAKE_FAST_ALLOCATED(GranularityStrategy);
 public:
     virtual ~GranularityStrategy();
     virtual SelectionStrategy GetType() const = 0;