STOUT-FACTORY: Update install shim error message.

Change the error message displayed when the install shim fails.

- On Stout, the internal KB isn't functional in recovery, so indicate
  CTRL+ALT+F3 must be hit on USB keyboard.
- Indicate possible causes for failure (ex. SSD is defective).

BUG=chrome-os-partner:15463.
TEST=None.

Change-Id: Ib9f0771dcf7b7a086300aea10d94ed35d4f4dc6e
Reviewed-on: https://chromium-review.googlesource.com/170347
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
1 file changed