Use std::shared_ptr in Epoll's callback list.

Ignore-AOSP-First: Awaiting security triage
Bug: 187862380
Bug: 190126442
Test: CtsInitTestCases
Change-Id: Ibb34a6b8a5675dbc515b7f8a43d7eecf2084510c
(cherry picked from commit aea97815308ab98faf1599c16d6190b787d34941)
diff --git a/init/Android.bp b/init/Android.bp
index 98e62fe..7eeafa2 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -387,6 +387,7 @@
 
     srcs: [
         "devices_test.cpp",
+        "epoll_test.cpp",
         "firmware_handler_test.cpp",
         "init_test.cpp",
         "keychords_test.cpp",