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Clean-up methods in PasswordsSettingsTestCase

PasswordsSettingsTestCase exposes a number of instance methods to do
instance-independent work. Those should either become class methods or
functions in the anonymous namespace.

Those methods are not related to the PasswordsSettingsTestCase class either,
and there already are helper functions in the anonymous namespace in
passwords_settings_egtest.mm. Therefore this CL moves the mentioned methods to
become functions in the anonymous namespace.

Bug: 744058
Change-Id: I1f8ede1d5bb4ef950f701cdefe407dc2d3bac0dd
Reviewed-on: https://chromium-review.googlesource.com/573025
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488176}