Update git submodules

Update git submodules

* Update skins/Timeless from branch 'REL1_31'
  to 2126f76540981047f072d672be5c15475a2556cf
  - Remove nonfunctional jquery mobile stuff

    Does not appear to work, and is possibly breaking things elsewise as
    well. In particular: chrome text selection in general, possibly iphone
    support?

    May or may not resolve the following; please test (does seem to
    effectively resolve T183215, for now, at least, but dunno at all about
    the other two.):

    Bug: T161470
    Bug: T183215
    Bug: T188387
    Change-Id: I2d4aae98fe47bce5a873bc44b6cea58f111f5086