[iOS][web] Remove unused method in CRWWebController

updateDesktopUserAgentForItem: wasn't used.

Bug: 938255
Change-Id: I55c8d849036c3bcdeae97ac7a245abf180a79973
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1511454
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639118}
1 file changed