Use std::shared_ptr in Epoll's callback list. Ignore-AOSP-First: Awaiting security triage Bug: 187862380 Bug: 184569329 Test: CtsInitTestCases Change-Id: Ibb34a6b8a5675dbc515b7f8a43d7eecf2084510c (cherry picked from commit aea97815308ab98faf1599c16d6190b787d34941) (cherry picked from commit 2cf268ab9fd5c4ac6ac4ce7d2ecead212f019fc0)