Chrome OS network metrics update
Add histogram "Network.Shill.DeviceRemovedEvent" for tracking device removed events per device (technology) type. Add histogram "Network.Shill.Cellular.DevicePresenceStatus", "Network.Shill.Ethernet.DevicePresenceStatus", "Network.Shill.Wifi.DevicePresenceStatus", and "Network.Shill.Wimax.DevicePresenceStatus" for tracking the presence of each network device in the system. The presence status is emitted once every 3 minutes for each device type. While here, update the value definitions for NetworkServiceError enum to match the definitions used in Shill. Also correct the histogram name for WiMax related histograms. BUG=chromium:411512, chromium:411510, chromium:402202 Review URL: https://codereview.chromium.org/589233003 Cr-Commit-Position: refs/heads/master@{#296223}
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