Ignore TaskQueue::DeleteJobs when worker terminated
From Tizen 7.0, tizen.ml is enabled in web worker. Because 'tizen'
and 'xwalk' extensions are loaded on web worker. Global TaskQueue
can be truncated at 'xwalk' instance is deleted.
This singleton TaskQueue should be truncated when main JS context
is destroyed, not by web worker.
Change-Id: I078a7217622d107799a9a47786d1680db5bed5db
Signed-off-by: DongHyun Song <dh81.song@samsung.com>
(cherry picked from commit
3f743e319889eefce19e73b3d181232cde185368)