[M120 Migration][VD][Perf] Avoid waiting for sandbox status from zygote

[M120 Migration][VD][Perf] Avoid waiting for sandbox status from zygote
to improve the browser launch time.

During initialization, the browser process wastes time waiting
until its zygote process is initialized.
The main reason for this synchronization is to avoid losing messages
between browser and zygote process.
browser does not need to wait for the synchronization before
sending messages, because messages are buffered on the zygote side

Reference:
  - https://review.tizen.org/gerrit/300627/

Change-Id: I9b4f490387eabe77e341cb2e52a7b18bee9b5de7
Signed-off-by: jiangyuwei <yuwei.jiang@samsung.com>