Expose Dock Side controls as separate controls instead of just 1
Expose Dock Side controls as separate controls instead of just 1

The accessible name of the Dock side menu item is
"Dock sideUndock into separate window Dock to left...",
since it gets its name from the names of its children.
This change labels the Dock side controller as "Dock side" instead.

Fixed: 1203625
Change-Id: Iadf61bbf8f7cf0d79f776a896457b5d7ab77fe79
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2939996
Commit-Queue: Johan Bay <c4a91c97e1f8a218202ca733f9e9f5122f475e0f@chromium.org>
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>
Reviewed-by: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>

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