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This CL moves web_kit_constants.* into //ios/web/navigation.

Bug: 956511
Change-Id: If4f9e93f7a138577c9719443e7a953beb1b84410
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1631372Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663840}