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In ChromeOS chrome/ browser tests, a NetworkChangeManagerClient gets
created, which initializes the network connection state. This
initialization was also happening in BrowserTestBase, which meant
that for chrome/ tests it was happening twice. This CL moves the
initialization logic into ContentBrowserTest, which isn't used in
chrome/ tests.

Bug: 927293
Change-Id: If506d90b1fe074e49b795a2e206b9ced68c5b9ba
Reviewed-on: https://chromium-review.googlesource.com/c/1457478Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630181}