Revert "Reapply "SharedMemory: mark fdsan ownership""

This reverts commit 2e2685c3.

Reason for revert: The reapplication reintroduces a memory leak
Bug: 393198065
Test: atest SharedMemoryFileDescriptorTest
(cherry picked from https://android-review.googlesource.com/q/commit:5ada3c5629d43e38ba6d2adf89cf69a94d5e0b69)
Merged-In: I5d410f05b061a41e089fa652e5565224a3488baf
Change-Id: I5d410f05b061a41e089fa652e5565224a3488baf