Deprecate DLOPEN_GNOME_KEYRING flag

chrome/browser/password_manager/native_backend_gnome_x.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_NATIVE_BACKEND_GNOME_X_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_NATIVE_BACKEND_GNOME_X_H_
 
 // libgnome-keyring has been deprecated in favor of libsecret.
 // See: https://mail.gnome.org/archives/commits-list/2013-October/msg08876.html
 //
@@ skipping 53 matching lines @@
 // Declare the actual function pointers that we'll use in client code.
 #define GNOME_KEYRING_DECLARE_POINTER(name) \
     static decltype(&::gnome_keyring_##name) gnome_keyring_##name;
   GNOME_KEYRING_FOR_EACH_FUNC(GNOME_KEYRING_DECLARE_POINTER)
 #undef GNOME_KEYRING_DECLARE_POINTER
 
   // Set to true if LoadGnomeKeyring() has already succeeded.
   static bool keyring_loaded;
 
  private:
-#if defined(DLOPEN_GNOME_KEYRING)
   struct FunctionInfo {
     const char* name;
     void** pointer;
   };
 
   // Make it easy to initialize the function pointers in LoadGnomeKeyring().
   static const FunctionInfo functions[];
-#endif  // defined(DLOPEN_GNOME_KEYRING)
 };
 
 // NativeBackend implementation using GNOME Keyring.
 class NativeBackendGnome : public PasswordStoreX::NativeBackend,
                            public GnomeKeyringLoader {
  public:
   explicit NativeBackendGnome(LocalProfileId id);
 
   ~NativeBackendGnome() override;
 
@@ skipping 55 matching lines @@
                            TimestampToCompare date_to_compare,
                            password_manager::PasswordStoreChangeList* changes);
 
   // The app string, possibly based on the local profile id.
   std::string app_string_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeBackendGnome);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_NATIVE_BACKEND_GNOME_X_H_