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It looks like we always need to call SetUpBundleOverrides no matter
what the process type is, so we can just call it from ChromeMain. This
will save us from needing to call this function from browser-specific
code in a later change.

While here, also remove a dead declaration.

Bug: 855193
Change-Id: I449d92ef9c7d80d066d4cfefb3015014bd407cc1
Reviewed-on: https://chromium-review.googlesource.com/1159335Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580285}