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The new class is a thin layer on top of NigoriKeyBag and introduces the
notion of a default encryption key, central in the Cryptographer API.

It has several advantages compared to the legacy DirectoryCryptographer:
1. Very small API, which in particular excludes the historic quirks and
   design decisions at the sync protocol level and in terms of storage
   in prefs (i.e. bootstrap token).

2. Separates the selection of the default encryption key to an explicit
   function call, which is also the only function that changes the
   default key, which is a privacy-sensitive operation.

3. Does not have the notion of pending keys, which we intend to remove
   from the Cryptographer API, as per existing TODOs.

Bug: 967417
Change-Id: I2d49e047a14a0e2cfe949a7655d3fadd2498f31c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824470
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#699803}