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This reverts commit 2d55caf6.

Reason for revert: fails tests downstream 

Original change's description:
> Fix URL clipping on iOS 11.
> 
> Wraps omnibox textfield into a container that positions the textfield
> inside of itself and clips its bounds so that the optimal clipping is
> used. The clipping logic replicates that of the pre-iOS 11 solution
> with UITextField overrides that are now broken in iOS 11.
> To mask the clipped ends of the omnibox, a ClippingMaskView is used
> as a maskView of the clipping view.
> All of this is behind kClippingTextfield flag that is enabled by
> default.
> 
> Bug: 749788
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: Ia03649618397d19990d39914fe1fb1b152b2760d
> Reviewed-on: https://chromium-review.googlesource.com/779191
> Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#525322}

TBR=rohitrao@chromium.org,sdefresne@chromium.org,justincohen@chromium.org,stkhapugin@chromium.org

Change-Id: I6b97cd711ef968ded8ff9a45574d6670b7c7f05f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 749788
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/837087Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525355}