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This is part 2 of the UpdateLibrary to UpdateEngineClient migration.

UpdateLibrary will be removed in the next patch.

BUG=chromium-os:16564
TEST=confirm that the update works as before from chrome://settings/about and OOBE screen.

Review URL: http://codereview.chromium.org/8585025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111190 0039d316-1c4b-4281-b951-d872f2087c98