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Split KeyboardShortcut and KeyboardShortcutList out of command.js, and
update them to use es6 class syntax.

These classes do not contain any ui and do not depend on cr.ui.define()
so should be straightforward to migrate to Polymer 3, unlike
cr.ui.Command itself. Moving them to a separate file allows the
FindShortcutBehavior and the bookmarks CommandManager to depend on
only keyboard_shortcut_list.js and not on command.js.

Bug: 1022213
Change-Id: I5478f7ac5820f5316ff8a07d047bdf20f76210cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1907773
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714770}