It looks like the GRUB_HIDDEN_TIMEOUT line in the /usr/share/grub/default/grub 
file comes from the setting at about line 60 of the debian/rules file for the 
grub2 source package (
  
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/trusty/grub2/trusty/view/head:/debian/rules
) :

ifeq (yes,$(shell dpkg-vendor --derives-from Ubuntu && echo yes))
DEFAULT_CMDLINE := quiet splash
DEFAULT_TIMEOUT := 10
DEFAULT_HIDDEN_TIMEOUT := 0

followed by
ifneq (,$(DEFAULT_HIDDEN_TIMEOUT))
        perl -pi -e 
's/^GRUB_TIMEOUT=.*/GRUB_HIDDEN_TIMEOUT=0\nGRUB_HIDDEN_TIMEOUT_QUIET=true\n$$&/'
 \
                debian/grub2-common/usr/share/grub/default/grub
at about line 367.

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https://bugs.launchpad.net/bugs/1258597

Title:
  Warning: Setting GRUB_TIMEOUT to a non-zero value when
  GRUB_HIDDEN_TIMEOUT is set is no longer supported.

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