Add support for cellular geolocation

chromeos/network/network_util.cc

Index: chromeos/network/network_util.cc
diff --git a/chromeos/network/network_util.cc b/chromeos/network/network_util.cc
index 8968d844ecd77f5265f14895a77c3c2cbfd06098..9d08c59fab8cb4ac3dddedced845176cac5aafdf 100644
--- a/chromeos/network/network_util.cc
+++ b/chromeos/network/network_util.cc
@@ -36,6 +36,12 @@ WifiAccessPoint::WifiAccessPoint(const WifiAccessPoint& other) = default;
 WifiAccessPoint::~WifiAccessPoint() {
 }
 
+CellTower::CellTower() {}
+
+CellTower::CellTower(const CellTower& other) = default;
+
+CellTower::~CellTower() {}
+
 CellularScanResult::CellularScanResult() {
 }