[heap] Remove unused PagedSpace::FindObject().

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 5103cbf11ef5c5d27836200c0feac34bc7ecbe48..d7f718c62b786541f29d23ee34b1e8ae574448e4 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -1914,12 +1914,6 @@ class PagedSpace : public Space {
   inline bool Contains(Object* o);
   bool ContainsSlow(Address addr);
 
-  // Given an address occupied by a live object, return that object if it is
-  // in this space, or a Smi if it is not.  The implementation iterates over
-  // objects in the page containing the address, the cost is linear in the
-  // number of objects in the page.  It may be slow.
-  Object* FindObject(Address addr);
-
   // During boot the free_space_map is created, and afterwards we may need
   // to write it into the free list nodes that were already created.
   void RepairFreeListsAfterDeserialization();