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This CL adds a hint string that advises users to match stored with
actually used passwords.
The string will be used on different editing surfaces (e.g. pwd check
and pwd editing from settings). This location also simplifies visibility
constraints due to modularization.

Translation screenshot for IDS_PASSWORD_EDIT_HINT:
https://storage.cloud.google.com/chromium-translation-screenshots/836fe6204aa775e50fa379738191cf32dd4f4f71

Bug: 1119424, 1092444
Change-Id: Iaf44a9a0b719545ecbbf43b28314de18bf51f703
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364636Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800044}