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This reverts commit 9b955d94.

Reason for revert: org.chromium.chrome.features.start_surface.StartSurfaceTest#testSearchInIncognitoSingleSurface__Instant_Return is flaky. I suspect this cl is the reason for that

Original change's description:
> [StartSurface] Switch to normal tab model on resume to V2 start surface
> 
> This CL also solves the scroll issue of the incognito description.
> 
> Screen records:
> Resume:
> https://drive.google.com/file/d/1jPFCAEwTDzI4PO-Ef-HdvRV6KeZoW4fD/view?usp=sharing
> 
> Scroll:
> https://drive.google.com/file/d/1C2lFMBKmdTaipWcHBG9mAYCJNuhoiYK_/view?usp=sharing
> 
> Bug: 1093506
> Change-Id: I5d7365daa530b23f897a19665076cbc32238224f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2243334
> Commit-Queue: Ganggui Tang <gogerald@chromium.org>
> Auto-Submit: Ganggui Tang <gogerald@chromium.org>
> Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
> Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#779878}

TBR=yusufo@chromium.org,gogerald@chromium.org,wychen@chromium.org

Change-Id: I97a65d561d8b3c3a28cf8a4b40b4354166669d8e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1097002
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252805Reviewed-by: Tanmoy Mollik <triploblastic@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780264}