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This CL is in preparation for converting the bluetooth pairing dialog
(BluetoothPairingUI) to use the MD Settings UI.

This CL:
* Eliminate Settings dependencies from the bluetooth dialog element
  and moves some dialog related error parsing into the dialog element.
* Moves some 'options' strings to settings_strings.grd in anticipation
  of removal of all options strings.
* Adds a new shared location for higher level shared chromeos
  elements: ui/webui/resources/chromeos. These elements are allowed to
  use I18nBehavior to simplify localization.
* Moves the bluetooth dialog element to the new shared location.

Bug: 748193
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I861730aa9cbbe5cb37a8df3d26f62d9f20429672
Reviewed-on: https://chromium-review.googlesource.com/592461
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491459}