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* Moves logging initialization function to a common location.
* Adds initializers to Context Provider, Cast Runner, Web Runner.
* Migrates WebEngineMainDelegate to use common function.

Bug: 951143
Change-Id: I031f2279a7bfdae81be3256ee40f7e73113fce77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785012
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695887}