Rename UserDataKey to be unique (components/autofill)

When building using jumbo, files gets merged and
functions with the same name may end up in the same
namespace/scope and conflict. This happens for
the function UserDataKey. Since the function relies
on that the static int is unique this function could
not be moved to a shared util file. Instead, the issue
was solved by renaming the function.

Bug: 869381
Change-Id: Ifd67ac865e9d0bad272cc51ef1af8c3a5b382893
Reviewed-on: https://chromium-review.googlesource.com/1160487
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#580483}
4 files changed