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which prevent grouping mechanism in MergeNetworkList from working.

The end result is that each Network after MergeNetworkList contains only 1 ip address. With this change, the grouping will happen correctly. WebRTC has logic to only retrieve single IP from each network for connectivity check already.

This CL is a dup of https://codereview.chromium.org/536133003/ which was created under the wrong identity.
BUG=

Review URL: https://codereview.chromium.org/565773003

Cr-Commit-Position: refs/heads/master@{#294912}