Handle the REPORTING_ERROR_EVENT state appropriately.
Handle the REPORTING_ERROR_EVENT state appropriately.

Notify the user of the error event if the user has been
notified about the update progress already. Stay quiet
otherwise.

BUG=chromium-os:5266
TEST=unit tests

Review URL: http://codereview.chromium.org/3033048

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@54789 0039d316-1c4b-4281-b951-d872f2087c98

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