[iOS][safari-data-import] Update history pending import string

Made it more general, as the user might not have multiple profiles on
the device.

Bug: N/A
Change-Id: I24787ff15599d82cc55fb7927365757e757e134b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6817965
Commit-Queue: Ginny Huang <ginnyhuang@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Alexis Hétu <sugoi@chromium.org>
Auto-Submit: Ginny Huang <ginnyhuang@chromium.org>
Commit-Queue: Alexis Hétu <sugoi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1496528}