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ObserverListThreadSafe was overkill since there was only two threads
involved, and only one observer.

Add MessageLoop member variables to various test classes that need it
(ObserverListThreadSafe had a hack that made it unnecessary before.)

BUG=103732
TEST=Start with a clean profile and set up sync.  about:profiler shouldn't
show ObserverListThreadSafe::Notify calls with sync threads anymore.


Review URL: http://codereview.chromium.org/8586014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110836 0039d316-1c4b-4281-b951-d872f2087c98