Fix cookie store Id in chrome.cookies.onChanged in incognito windows

BUG=322527

Review URL: https://codereview.chromium.org/102113002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238666 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238666