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This CL prepares for the introduction of the new "passwords on device"
WebUI page. It extracts the logic that is common with the existing page
into a new PasswordsListHandler Polymer component. This includes mostly
handling requests for copying a password, viewing its details (Edit
Dialog) and removing it. The new component does not own the list of
saved passwords, those are still retrieved by its embedder. The lists
with different subsets of saved passwords (all, device-only or
device+account) will be injected by the embedder as well.

Bug: 1049141
Change-Id: Iefb9e6bd7d58f43ff4ed57f74983f939b0e1eb40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224860
Commit-Queue: Victor Vianna <victorvianna@google.com>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774549}