Add a dummy entry with libsecret when initializing OSCrypt.

chrome/browser/password_manager/native_backend_libsecret.h

Index: chrome/browser/password_manager/native_backend_libsecret.h
diff --git a/chrome/browser/password_manager/native_backend_libsecret.h b/chrome/browser/password_manager/native_backend_libsecret.h
index 2f5f7772834ecf8dd14cd827a26df4b95a2c4703..082f3649fc3fb8bad534df6a7e729101ee2c1a85 100644
--- a/chrome/browser/password_manager/native_backend_libsecret.h
+++ b/chrome/browser/password_manager/native_backend_libsecret.h
@@ -105,6 +105,10 @@ class NativeBackendLibsecret : public PasswordStoreX::NativeBackend {
   // The app string, possibly based on the local profile id.
   std::string app_string_;
 
+  // True if we're already ensured that the default keyring has been unlocked
+  // once.
+  bool ensured_keyring_unlocked_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeBackendLibsecret);
 };