Revert 247250 "TrackedPreferences are initialized when a profile..."
It was causing crashes in some Android tests.

> TrackedPreferences are initialized when a profile is created or loaded. But profiles that have not been loaded are not being tracked.
> 
> At startup, identify profiles whose PrefHashStores have not been initialized and initialize them.
> 
> BUG=336478
> 
> Review URL: https://codereview.chromium.org/117593002

TBR=erikwright@chromium.org

Review URL: https://codereview.chromium.org/139263012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247284 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247284