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The dialog has the accessible name "accounts and sync". It also has a
visible title and subtitle which indicate the user account name and
email or login status.

Making these title/subtitle part of the accessible name, we expect them
to be properly announced when the dialog is open, in particular, on Mac
OS X where previous workarounds did not work.

We partially undo the previous workaround, with a specific provision
for crbug.com/1161166. Still, some double-speech happens due to the
existing crbug.com/1161135.

Behavior on Mac:

* Reads "accounts and sync" plus title and subtitle twice due to
  crbug.com/1161135.

Behavior on Linux:

* Reads "accounts and sync" plus title and subtitle once thanks to a
  workaround for crbug.com/1161166.

Behavior on Windows, NVDA:

* Reads "accounts and sync" plus title and subtitle once.

Behavior on Windows, JAWS:

* Reads "accounts and sync" plus title and subtitle once when open,
  then twice when tabbing into the dialog due to crbug.com/1161135.

Bug: 1078580, 1161166
Change-Id: I483645ea482ef5101d8f9515027ea3129f46aad6
AX-relnotes: Mac, accounts & sync: announce dialog title and subtitle.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600976
Commit-Queue: Jacobo Aragunde Pérez <jaragunde@igalia.com>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839090}