[telemetry] Change Cloud Storage download error to a warning.
[telemetry] Change Cloud Storage download error to a warning.

It's failing while attempting to update the files, but if you just ran record_wpr, you haven't uploaded the WPR files yet.


BUG=None.
TEST=None.

Review URL: https://chromiumcodereview.appspot.com/22999023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@219088 0039d316-1c4b-4281-b951-d872f2087c98

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