message: Fix error in comment
  'Free' makes no sense in context. It should be 'Finish'.
diff: @@ -254,8 +254,8 @@ class HeapAlgorithm {
  Alloc(buffer, size);
  }
  - // Finish collects the buffer offset assignment results. Free may only be
  - // called once, after the Alloc and Free calls.
  + // Finish collects the buffer offset assignment results. Finish may only be
  + // called once, after all Alloc and Free calls.
  virtual Result Finish() = 0;
  };
  