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This CL makes ChromeSigninClient use content::NetworkConnectionTracker
instead of net::NetworkChangeNotifier.

This CL additionally modifies NetworkConnectionTracker's
constructor so we can mock it in TestingBrowserProcess and tests.

Bug: 754709
Change-Id: Ic05662830839403d5b327793f8faf7284a0da0bd
Reviewed-on: https://chromium-review.googlesource.com/757583Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515965}