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This reverts commit 2aa1a2f6.

Reason for revert: Potential culprit for crbug.com/1152587

Original change's description:
> [iOS] Set FirstResponderSendAction as default
>
> Remove experiment flag, and set enabled behavior as default.
>
> Keep old behavior when asking the NTP and WebView to become first
> responder. This is done checking if the first responder is a view, and
> asking if not. Because in the previous logic for GetFirstResponder() the
> search was made in the view hierarchy, ignoring view controllers.
>
> The experiment enabled without the check added in this CL could explain
> issues like crbug.com/1150498.
>
> Bug: 816427, 1150498
> Change-Id: Ib9ac17b59da8635d00beff071aee4bd6afeedb78
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495976
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Commit-Queue: Javier Flores <javierrobles@chromium.org>
> Auto-Submit: Javier Flores <javierrobles@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#830632}

TBR=gambard@chromium.org,javierrobles@chromium.org

Change-Id: If4c1451b7ed278b02164f0816d8b01bf11314289
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 816427
Bug: 1150498
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560097Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830927}