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PrefService requires home directory to be setup before the
underlying pref store (JsonPrefStore) can be initialized
properly.

Now that the creation of PrefService is moved from
CastBrowserMainParts::PreCreateThreads
to CastMainDelegate::PostEarlyInitialization, we need
to do the same for home directory creation as well.

Bug: internal b/119800555
Test: Test locally on a cast build
Change-Id: I513680c3b30dbd0c9cc862d87604376e502be763
Reviewed-on: https://chromium-review.googlesource.com/c/1352038Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Simeon Anfinrud <sanfin@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611540}