[iOS][MF] Add loading indicator to use other password.

This is done by separating the responsibilities of the password
coordinator in 2 different coordinators, each of which has their own
fetchers and only present one view controller, previously was 2.
The PasswordListDelegate was renamed to PasswordListNavigator, which is
a more appropriate name, considering it doesn't follow the conventions
for delegates.

Bug: 932089
Change-Id: I7e336424d8affad166dff3880ee1726edec1c6e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496999
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637719}
9 files changed