Capitalize "error" to match with the other utility functions.
Capitalize "error" to match with the other utility functions.

Fatal and Warning functions already output their strings capitalized,
we were just missing the Error function. So capitalize it now.

Signed-off-by: Thiago Farina <328b27c99317b12d4abcd46c4810451f3997abf9@chromium.org>

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