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This CL removes the explicit conversion from (and to) std::string and
CoreAccountId.

Bug: 959157

Change-Id: Ibfc5ca50bf595a089e63ed1462361cbe8a316001
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926482Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Tanmoy Mollik <triploblastic@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717650}