--- old/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2019-02-27 09:29:41.794325498 +0100
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	2019-02-27 09:29:41.589318930 +0100
@@ -1186,11 +1186,6 @@
   // non-object.
   virtual HeapWord* block_start(const void* addr) const;
 
-  // Requires "addr" to be the start of a chunk, and returns its size.
-  // "addr + size" is required to be the start of a new chunk, or the end
-  // of the active area of the heap.
-  virtual size_t block_size(const HeapWord* addr) const;
-
   // Requires "addr" to be the start of a block, and returns "TRUE" iff
   // the block is an object.
   virtual bool block_is_obj(const HeapWord* addr) const;