Add all components to "gn check".

components/wifi_sync/BUILD.gn

Index: components/wifi_sync/BUILD.gn
diff --git a/components/wifi_sync/BUILD.gn b/components/wifi_sync/BUILD.gn
index 034442895505a764e4ede950a14911a4ffb7e689..72ac120899b62cc0950d9305fd831c31a837c38a 100644
--- a/components/wifi_sync/BUILD.gn
+++ b/components/wifi_sync/BUILD.gn
@@ -22,21 +22,22 @@ source_set("wifi_sync") {
 
   deps = [
     "//base",
+    "//base:i18n",
+    "//components/keyed_service/content",
+    "//components/keyed_service/core",
     "//components/onc",
+    "//content/public/browser",
     "//sync",
   ]
+
+  if (is_chromeos) {
+    deps += [ "//chromeos" ]
+  }
 }
 
 source_set("unit_tests") {
   testonly = true
 
-  deps = [
-    ":wifi_sync",
-    "//sync",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-
   sources = [
     "wifi_config_delegate_chromeos_unittest.cc",
     "wifi_credential_syncable_service_unittest.cc",
@@ -44,4 +45,14 @@ source_set("unit_tests") {
     "wifi_security_class_chromeos_unittest.cc",
     "wifi_security_class_unittest.cc",
   ]
+
+  deps = [
+    ":wifi_sync",
+    "//base",
+    "//chromeos",
+    "//components/onc",
+    "//sync:test_support_sync_api",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
 }