Revert "Refactor android_view_MotionEvent_obtainAsCopyFromNative implementation"

This reverts commit 3d8cc938.

Reason for revert: b/326506223
This CL has been flagged to be causing significant increase in
unreachable memory bytes. Reverting to validate this finding, will
followup with a proper fix if needed.

Test: presubmit
Test: atest MotionEventTest
Change-Id: Id2cefb4cbd768ed2debb7cbbf9ba912826e64a85