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TaskScheduler requires the FeatureList, so it needs to be moved
from CastBrowserMainParts::PreCreateThreads() to an earlier point,
CastMainDelegate::PostEarlyInitialization().

The creation of the "singleton" FieldTrialList instance also needs
to be moved to CastMainDelegate::PostEarlyInitialization(), since the
FeatureList initialization depends on the FieldTrialList. Its
ownership was transferred from BrowserMainParts to CastMainDelegate.

A new CastFeatureListCreator class holds ownership of the service
while the browser process isn't started.

Bug: 887459
Change-Id: I4bcd60720518807e2089ec99a3f7db3e647203d6
Reviewed-on: https://chromium-review.googlesource.com/c/1308096
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Xi Han <hanxi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604920}