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This reverts commit 21eb2224.

Reason for revert: Causing failures on ios_web_unittests on iOS12

https://ci.chromium.org/p/chrome/builders/ci/iphone-device/7949

Original change's description:
> [iOS] Restore the user agent only on iOS 13+
> 
> This CL restrict the user agent restoration to iOS 13 and further as
> iOS 12 has an issue getting the right User Agent.
> 
> Bug: 1070593
> Change-Id: Ie4570efcb9931ccb8662511b16a1298570f0a297
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154189
> Reviewed-by: Justin Cohen <justincohen@chromium.org>
> Commit-Queue: Gauthier Ambard <gambard@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#760057}

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

Change-Id: I0458f2cea4df855599dd8fa72692b7ff4840ef06
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1070593
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153733Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760192}