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This removes the need for NavigatorNetworkInformation and
WorkerNavigatorNetworkInformation.

Bug: 1147612
Change-Id: I59f178cf746be7bf25c0246e6fc312f912b9ec47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533636
Commit-Queue: Nate Chapin <japhet@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827295}