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This reverts commit a4ae2e1f.

Reason for revert:
All/AutofillInteractiveIsolationTest.SimpleCrossSiteFill/1 started
to fail on ChromeOS likely after this change.
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-chromeos-rel/8133
https://ci.chromium.org/buildbot/chromium.chromiumos/linux-chromeos-dbg/5701

Original change's description:
> Render Tabs into Bottom sheet
> 
> This CL shapes the role of a KeyboardAccessoryData.Tab element:
> It is an element that provides a specific benefit to the Manual UI by...
> ... providing data that is used by the bar to render a tab (upcoming)
> ... providing the content for a separate tab in the bottom sheet.
> 
> This means, that the bottom sheet provides space for tabs and manages the
> general visibility and active states of tabs.
> The exact content of a tab doesn't matter to the AccessorySheetComponent.
> That way, it should become fairly straight forward to implement a new tab
> that is rendered into bottom sheet and accessory.
> 
> The first concrete instance of a bottom sheet will follow soon: a
> bottom sheet that contains password related actions and data.
> (It's important to not mix this specific data into the AccessorySheet
> component as other upcoming sheets are already planned, like one for
> payments and one for address data.)
> 
> Bug: 811747
> Change-Id: Id8bd8c389496246166d26a6c298056a142c36566
> Reviewed-on: https://chromium-review.googlesource.com/1047285
> Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
> Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#559180}

TBR=bauerb@chromium.org,fhorschig@chromium.org

Change-Id: I879e4e89c674d47562c662b5c2bbac3487546062
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 811747
Reviewed-on: https://chromium-review.googlesource.com/1063732Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559463}