Convert path usage in NetworkListViewBase subclasses to use guids.

ash/common/system/chromeos/network/vpn_list_view.h

Index: ash/common/system/chromeos/network/vpn_list_view.h
diff --git a/ash/common/system/chromeos/network/vpn_list_view.h b/ash/common/system/chromeos/network/vpn_list_view.h
index 399709add17ed209327b816445a2358f3955d9a0..6b9c3a8220344dea7b2e41684e33d72c35deacdb 100644
--- a/ash/common/system/chromeos/network/vpn_list_view.h
+++ b/ash/common/system/chromeos/network/vpn_list_view.h
@@ -50,8 +50,7 @@ class VPNListView : public NetworkListViewBase,
 
   // NetworkListViewBase:
   void Update() override;
-  bool IsNetworkEntry(views::View* view,
-                      std::string* service_path) const override;
+  bool IsNetworkEntry(views::View* view, std::string* guid) const override;
 
   // VpnList::Observer:
   void OnVPNProvidersChanged() override;
@@ -78,9 +77,8 @@ class VPNListView : public NetworkListViewBase,
   // A mapping from each VPN provider's list entry to the provider.
   std::map<const views::View* const, VPNProvider> provider_view_map_;
 
-  // A mapping from each network's list entry to the network's service path.
-  std::map<const views::View* const, std::string>
-      network_view_service_path_map_;
+  // A mapping from each network's list entry to the network's guid.
+  std::map<const views::View* const, std::string> network_view_guid_map_;
 
   // Whether the list is currently empty (i.e., the next entry added will become
   // the topmost entry).