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The service manager thread and (TODO) ServiceManager might be created
before the full browser starts, and we want to reuse them when starting
the full browser. Therefore, we add a pointer of BrowserStartupData in
MainFunctionParams.

Particularly, in this CL, ContentMainRunnerImpl creates and owns a
BrowserStartupData object. It passes a pointer of the BrowserStartupData
through the main function parameter to BrowserMainLoop.

The BrowserStartupData interface was introduced in:
https://crrev.com/c/1117471.

Bug: 846846, 853308
Change-Id: Ie11063227a670cd8d72935131e854ee2b5c46e4e
Reviewed-on: https://chromium-review.googlesource.com/1108178
Commit-Queue: Xi Han <hanxi@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574054}