Merged Tether and cellular network types in System Tray.

ash/system/network/network_info.h

Index: ash/system/network/network_info.h
diff --git a/ash/system/network/network_info.h b/ash/system/network/network_info.h
index d0055fd5540013654a0a435180bc721fc2b22b65..fd838c83881a76f42ac089389948781fbfa99615 100644
--- a/ash/system/network/network_info.h
+++ b/ash/system/network/network_info.h
@@ -19,7 +19,7 @@ namespace ash {
 // Includes information necessary about a network for displaying the appropriate
 // UI to the user.
 struct NetworkInfo {
-  enum class Type { UNKNOWN, WIFI, TETHER, CELLULAR };
+  enum class Type { UNKNOWN, WIFI, CELLULAR };
 
   NetworkInfo();
   NetworkInfo(const std::string& guid);