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ios/web/common directory contains common code shared between //ios/web
and the rest of the layers (//components, //ios/chrome, //ios/web_view).
This directory does not contain the public API to create and manage web
contents (//ios/web/public is public API directory).

The files which are moved in this CL contain 2 functions:
 - bool UrlHasWebScheme(const GURL& url)
 - bool UrlHasWebScheme(NSURL* url))
Both these functions conceptually belong to ios/web, but they don't belong
to ios/web/public. ios/web/common is existing directory, which mirrors
content/common, and ios/web/common seems like the most appropriate place
for these functions among existing directories.

The proposal to move the files was discussed on this doc:
https://docs.google.com/document/d/1C2YIU0rDbH5wz2VI6nk0COrktwY3DbF-e7QbMIAKEJc/edit

Bug: 942244
Change-Id: Ib5c09134b3026f25e545fb436c9313b71b7a4c74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709000
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Yi Su <mrsuyi@chromium.org>
Reviewed-by: John Wu <jzw@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680050}