honghaiz db8cf50c59 Fix two problems in network.cc:
1. It signals network changed events whenever there are more than one IP address in a network.
2. It does not signal network changed events if a network disconnects and connects again.
Also changed DumpNetworks for better debugging.

BUG=webrtc:5096

Review URL: https://codereview.webrtc.org/1421433003

Cr-Commit-Position: refs/heads/master@{#11107}
2015-12-21 21:08:54 +00:00
..
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Name: WebRTC
URL: http://www.webrtc.org
Version: 90
License: BSD
License File: LICENSE

Description:
WebRTC provides real time voice and video processing
functionality to enable the implementation of 
PeerConnection/MediaStream.

Third party code used in this project is described 
in the file LICENSE_THIRD_PARTY.