Fix //components/os_crypt to build for iOS with gn.

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index ec8e569f6202df25b9e06f2e5384f72ec2a48a5c..85ea035624006b2926ce6656da3fe4afb5a6e76c 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -44,6 +44,7 @@ group("all_components") {
     "//components/omnibox/browser",
     "//components/infobars/core",
     "//components/version_ui",
+    "//components/os_crypt",
   ]
 
   if (!is_ios) {
@@ -107,7 +108,6 @@ group("all_components") {
       "//components/offline_pages",
       "//components/onc",
       "//components/open_from_clipboard",
-      "//components/os_crypt",
       "//components/packed_ct_ev_whitelist",
       "//components/pairing",
       "//components/password_manager/content/browser",
@@ -331,6 +331,7 @@ test("components_unittests") {
     "//components/leveldb_proto:unit_tests",
     "//components/suggestions:unit_tests",
     "//components/omnibox/browser:unit_tests",
+    "//components/os_crypt:unit_tests",
   ]
 
   if (!is_ios) {
@@ -393,7 +394,6 @@ test("components_unittests") {
       "//components/network_time:unit_tests",
       "//components/offline_pages:unit_tests",
       "//components/open_from_clipboard:unit_tests",
-      "//components/os_crypt:unit_tests",
       "//components/packed_ct_ev_whitelist:unit_tests",
       "//components/password_manager/content/browser:unit_tests",
       "//components/password_manager/core/browser:unit_tests",