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Some tests cannot create a proper task environment for running a real
instance of Chrome OS Account Manager.

Allow the creation and initialization of Chrome OS Account Manager in
ephemeral mode where it will not require a task environment for
initialization.

Bug: 1100833
Test: chromeos_components_unittests --gtest_filter="*AccountManager*Test*"
Change-Id: I181dbde347f91530ded431d4f8a505f9c6c30be8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2283305Reviewed-by: Anastasiia N <anastasiian@chromium.org>
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790311}