[M120 Migration][VD] Save CookieSettings at NetworkContext.

[M120 Migration][VD] Save CookieSettings at NetworkContext.

Now CookieSettings is saved in CookieManager, and it will need to be
used in RestrictedCookieManager, and it may be delete before
RestrictedCookieManager. This patch makes CookieSettings be saved at
NetworkContext instead of at CookieManager to prevent a crash in
RestrictedCookieManager.

Reference:
 - https://review.tizen.org/gerrit/302584/

Change-Id: If3fcb2002634aaf901ad8d65b8def001a487ea64
Signed-off-by: jiangyuwei <yuwei.jiang@samsung.com>