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This cl removes onPrimaryAccountSet/Changed methods from the java
IdentityManger. All of the usages of these methods has been replaced by
onPrimaryAccountChanged on the java side.

Bug: 1158855
Change-Id: I4e0deeaa0e127f65e4e43c429dec26963111f736
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2608148Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841050}