Add WiFi SSID getter to NetworkChangeNotifier.

chrome/browser/predictors/resource_prefetch_common_unittest.cc

Index: chrome/browser/predictors/resource_prefetch_common_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetch_common_unittest.cc b/chrome/browser/predictors/resource_prefetch_common_unittest.cc
index 61089d6168129846ef8c671f509c871f0de10c0c..2c765192fdd0403043505999702bbee64319bb54 100644
--- a/chrome/browser/predictors/resource_prefetch_common_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_common_unittest.cc
@@ -30,6 +30,9 @@ class MockNetworkChangeNotifierWIFI : public NetworkChangeNotifier {
   ConnectionType GetCurrentConnectionType() const override {
     return NetworkChangeNotifier::CONNECTION_WIFI;
   }
+  std::string GetCurrentWiFiSSID() const override {
+    return "";
+  }
 };
 
 class MockNetworkChangeNotifier4G : public NetworkChangeNotifier {
@@ -37,6 +40,9 @@ class MockNetworkChangeNotifier4G : public NetworkChangeNotifier {
   ConnectionType GetCurrentConnectionType() const override {
     return NetworkChangeNotifier::CONNECTION_4G;
   }
+  std::string GetCurrentWiFiSSID() const override {
+    return "";
+  }
 };
 
 } // namespace