Add //chromeos dependency in //extensions/browser/api/networking_private

extensions/browser/api/networking_private/BUILD.gn

Index: extensions/browser/api/networking_private/BUILD.gn
diff --git a/extensions/browser/api/networking_private/BUILD.gn b/extensions/browser/api/networking_private/BUILD.gn
index 70057df7be25ef6873dda980f05e3f905f92434d..c74f2a6afd3cb5f93b4bb819c842bd04b3804722 100644
--- a/extensions/browser/api/networking_private/BUILD.gn
+++ b/extensions/browser/api/networking_private/BUILD.gn
@@ -10,15 +10,12 @@ source_set("networking_private") {
     "networking_cast_private_delegate.h",
     "networking_private_api.cc",
     "networking_private_api.h",
-    "networking_private_chromeos.cc",
-    "networking_private_chromeos.h",
     "networking_private_delegate.cc",
     "networking_private_delegate.h",
     "networking_private_delegate_factory.cc",
     "networking_private_delegate_factory.h",
     "networking_private_delegate_observer.h",
     "networking_private_event_router.h",
-    "networking_private_event_router_chromeos.cc",
     "networking_private_event_router_factory.cc",
     "networking_private_event_router_factory.h",
   ]
@@ -45,5 +42,12 @@ source_set("networking_private") {
       "networking_private_service_client.h",
     ]
     deps += [ "//components/wifi" ]
+  } else if (is_chromeos) {
+    sources += [
+      "networking_private_chromeos.cc",
+      "networking_private_chromeos.h",
+      "networking_private_event_router_chromeos.cc",
+    ]
+    deps += [ "//chromeos" ]
   }
 }