Use the correct thread to access g_browser_process.
Since g_browser_process can only be accessed by ui thread, and GoogleUpdateSettings::GetCollectStatsConsent should be called by FILE thread, it doesn't make sense to put them in the same function, which is executed through posttask on FILE thread.
Schedules only GoogleUpdateSettings::GetCollectStatsConsent on FILE thread, and does everything else on IO thread in ShowForReal()
BUG=
Review URL: https://codereview.chromium.org/
369933002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281865 0039d316-1c4b-4281-b951-d872f2087c98