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This reverts commit a49e194d.

Reason for revert: breaks ChromeOS Assistant key
Bug: b:130291631

Original change's description:
> Chrome OS: Add DOM |code| mappings for new action keys.
> 
> Wilco emits action key codes directly from kernel instead of
> function-key codes. This CL adds new Dom codes or fixes existing Dom
> codes accordingly. They are:
> 
> key code             Dom code
> -----------------------------------------------------
> KEY_SCALE            SHOW_ALL_WINDOWS (new)
> KEY_SWITCHVIDEOMODE  DISPLAY_TOGGLE_INT_EXT (new)
> KEY_ZOOM             ZOOM_TOGGLE (fix evdev/xkb value)
> KEY_ASSISTANT        LAUNCH_ASSISTANT (fix HID value)
> 
> Also removed invalid dom-code values for ZOOM_TOGGLE and
> LAUNCH_ASSISTANT.
> 
> Bug: 949730, 950099
> Change-Id: I3028cdcab82a4f806fc3a84f5b5bd64ffea053ce
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1549725
> Reviewed-by: Wez <wez@chromium.org>
> Commit-Queue: Georges Winkenbach <gwink@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#648388}

TBR=wez@chromium.org,garykac@chromium.org,dtor@chromium.org,gwink@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 949730, 950099
Change-Id: If1e0fc961eff0a08936d535dde4504542fe64058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562618Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649698}