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Check interface for wireless extensions to determine if it is a wifi connection. Check SIOCETHTOOL for ethernet. GetCurrentConnectionType will return the CONNECTION_UNKNOWN unless all connections are the same type.

R=pauljensen@chromium.org
BUG=160537

Review URL: https://codereview.chromium.org/739983005

Cr-Commit-Position: refs/heads/master@{#314042}