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Also, prepare PowerManagerDbusClient for change in power manager for bug chromium-os:21360

TEST=manual
BUG=chromium-os:20832


Review URL: http://codereview.chromium.org/8491054

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109777 0039d316-1c4b-4281-b951-d872f2087c98