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I thought we wouldn't need a mock for this, but I was wrong.
To properly fix crosbug.com/22183, we need to mock out DBusThreadManager.
As always, it's never too late to do the right thing.

BUG=chromium-os:22197
TEST=D-Bus functions work as before (brightness change keys work)

Review URL: http://codereview.chromium.org/8343069

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107853 0039d316-1c4b-4281-b951-d872f2087c98