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This CL extracts the content-type utility into
//ios/web/web_view/content_type_util.* so that it can be shared between
CRWWebController, WebStateImpl and CRWWKNavigationHandler.

Bug: 956511
Change-Id: I0097d7b89c0f0f972beadf7753c34097a0c0847e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634730
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665494}