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This reverts commit 480313d9.

Reason for revert: https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8901505278757132992/+/steps/compile/0/stdout

Original change's description:
> Remove unused headers from ios/web/public/web_state
> 
> This CL removes web_state_observer.h and web_state.h from
> ios/web/public/web_state which are no longer used in downlstream repo
> (downstream code was switched to use files from ios/web/public).
> 
> Bug: 942244
> Change-Id: I1480b115343735a69347578cfd0628f983c069ca
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816807
> Commit-Queue: Yi Su <mrsuyi@chromium.org>
> Auto-Submit: Eugene But <eugenebut@chromium.org>
> Reviewed-by: Yi Su <mrsuyi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#698929}

TBR=eugenebut@chromium.org,mrsuyi@chromium.org

Change-Id: I7f9a7453be97af8ecd702ac4392e73416ce7dc7d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 942244
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815914Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698938}