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The goal is to introduce a proper type for CoreAccountInfo's
account_id to prevent incorrect uses. Before this CL it was a
std::string and sometimes was used as an email or a gaia id
which was incorrect but sometimes working.

The CL makes the struct CoreAccountId implicitly convertible
to/from std::string as using a proper type would make the
size of the CL intractible. Multiple followup CLs will fix
the code and eventually the conversion will be explicit.

Bug: 959158
Change-Id: Ia8295b71fa212118115db5f53b5fe845c7992a83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1596749Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@google.com>
Cr-Commit-Position: refs/heads/master@{#659001}