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This change updates the service_manager::Instance code to reference its
options_.instance_sharing value instead of "service_manager:all_users"
and "service_manager:singleton" in the "required" section of its
interface provider specs.
Tests and existing manifests were updated accordingly.

Bug: 866967
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:linux_mojo;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win10_chromium_x64_rel_ng
Change-Id: I699ec3411b7ec84023fbb56f85186ad5519515c4
Reviewed-on: https://chromium-review.googlesource.com/1195892Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587809}