Make it so that turning off sync for extensions in the preferences UI also turns off sync for extension settings, ditto for apps and app settings.
Make it so that turning off sync for extensions in the preferences UI also
turns off sync for extension settings, ditto for apps and app settings.


BUG=98488
TEST=Manually by bringing up two browser instances and enabling/disabling
extension/app sync in preferences.


Review URL: http://codereview.chromium.org/8479026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109779 0039d316-1c4b-4281-b951-d872f2087c98

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