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This change merges the separate Cocoa and Views implementations of these
functions into a single implementation that chooses the correct table at
runtime. This fixes GlobalKeyboardShortcutsTest.* in polychrome-cocoa, and
all but one of GlobalKeyboardShortcutsTest.* in polychrome-views.

Bug: 817408
Change-Id: I57e333ee2fcec2ac21fb2920a7d5794b774de204
Reviewed-on: https://chromium-review.googlesource.com/975583Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545136}