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This CL makes sure that the user agent used at the creation of the
WebView is the correct one when the default user agent is automatic.

Bug: 1025225
Change-Id: I9e4408b0ff0fb36a2904f9f9304480656b60ab7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047189
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740334}