Let's get rid of delete as much as possible, here are some examples.
Summary: If a class owns an object: - If the object can be null => use a unique_ptr. no delete - If the object can not be null => don't even need new, let alone delete - for runtime sized array => use vector, no delete. Test Plan: make check Reviewers: dhruba, heyongqiang Reviewed By: heyongqiang CC: leveldb, zshao, sheki, emayanke, MarkCallaghan Differential Revision: https://reviews.facebook.net/D9783
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