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The wrapper was used to provide references to SigninManager while the
transition to IdentityManager was ongoing. The ancestor of this CL*
will complete that transition, so we can delete this wrapper.

*https://chromium-review.googlesource.com/c/chromium/src/+/1175911

Bug: 809031
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I359d2beebdf76d6620ec46b5bc58748ebb61e544
Reviewed-on: https://chromium-review.googlesource.com/1175916
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587724}