gn: Use a separate flag for enabling libgnome-keyring support.

components/os_crypt/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
+import("//components/os_crypt/features.gni")
 
-if (is_desktop_linux) {
+if (use_gnome_keyring) {
   # Gnome-keyring is normally dynamically loaded. The gnome_keyring config
   # will set this up.
   pkg_config("gnome_keyring") {
     packages = [ "gnome-keyring-1" ]
     defines = [ "USE_GNOME_KEYRING" ]
     ignore_libs = true
   }
 
   # If you want to link gnome-keyring directly (use only for unit tests)
   # ADDITIONALLY add this config on top of ":gnome_keyring". pkg-config is a
@@ skipping 49 matching lines @@
 
   if (is_desktop_linux) {
     sources -= [ "os_crypt_posix.cc" ]
     sources += [
       "key_storage_linux.cc",
       "key_storage_linux.h",
       "os_crypt_linux.cc",
     ]
     defines = []
 
+    if (use_gnome_keyring) {
+      sources += [
+        "keyring_util_linux.cc",
+        "keyring_util_linux.h",
+      ]
+      configs += [ ":gnome_keyring" ]
+    }
     if (use_glib) {
       sources += [
         "key_storage_libsecret.cc",
         "key_storage_libsecret.h",
-        "keyring_util_linux.cc",
-        "keyring_util_linux.h",
         "libsecret_util_linux.cc",
         "libsecret_util_linux.h",
       ]
-      configs += [
-        "//build/config/linux:glib",
-        ":gnome_keyring",
-      ]
+      configs += [ "//build/config/linux:glib" ]
       deps += [ "//third_party/libsecret" ]
       defines += [ "USE_LIBSECRET" ]
     }
     if (use_dbus) {
       sources += [
         "key_storage_kwallet.cc",
         "key_storage_kwallet.h",
         "kwallet_dbus.cc",
         "kwallet_dbus.h",
       ]
@@ skipping 57 matching lines @@
     if (use_dbus) {
       sources += [
         "key_storage_kwallet_unittest.cc",
         "kwallet_dbus_unittest.cc",
       ]
       deps += [ "//dbus:test_support" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }