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Split out KeyboardShortcutDelegate into a separate file to break the
following circular dependency, created when we migrate to Polymer 3:

- shortcut_input.* depends on the KeyboardShortcutDelegate class from
keyboard_shortcuts.*
- keyboard_shortcuts.* imports shortcut_input.*, since it uses
shortcut-input.

Bug: 1004967
Change-Id: I9b75267eddea8eb4555b2080a90ba7e8ffca0a6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832792Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701372}