Adding allocator annotations to blink classes and structs.

Source/core/editing/SelectionController.h

Index: Source/core/editing/SelectionController.h
diff --git a/Source/core/editing/SelectionController.h b/Source/core/editing/SelectionController.h
index 4fd749e18267294677c68ce3d40ac454c9d70c7c..d3a246472e877ab91791af437a182032c12d3ee4 100644
--- a/Source/core/editing/SelectionController.h
+++ b/Source/core/editing/SelectionController.h
@@ -41,6 +41,7 @@ class VisibleSelection;
 
 class SelectionController final : public NoBaseWillBeGarbageCollected<SelectionController> {
     WTF_MAKE_NONCOPYABLE(SelectionController);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(SelectionController);
 public:
     static PassOwnPtrWillBeRawPtr<SelectionController> create(LocalFrame&);
     DECLARE_TRACE();