Yueh-Hsuan Chiang fcac705f95 Fixed compile warning on Mac caused by unused variables.
Summary:
Fixed compile warning caused by unused variables.

./db/compaction_picker.h:118:7: error: private field 'max_grandparent_overlap_factor_' is not used [-Werror,-Wunused-private-field]
  int max_grandparent_overlap_factor_;
      ^
./db/compaction_picker.h:119:7: error: private field 'expanded_compaction_factor_' is not used [-Werror,-Wunused-private-field]
  int expanded_compaction_factor_;
      ^
2 errors generated.

Test Plan:
make db_test
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