GitLab

Use a new class 'UserSessionInitializer' to handle common initialization
logics in 'ChromeSessionManager' and 'UserSessionManager'. Whenever
profiles are loaded, corresponding methods in the observer will be
triggered.

Bug: 977489
Change-Id: I24259636906d80cfbec48268eb0c68aa851a4df7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2044278
Commit-Queue: Anqing Zhao <anqing@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746258}