chrome: Cleanup class/struct forward declarations

chrome/browser/password_manager/native_backend_kwallet_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_KWALLET_X_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_NATIVE_BACKEND_KWALLET_X_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/nix/xdg_util.h"
 #include "base/time/time.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
 #include "chrome/browser/password_manager/password_store_x.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/os_crypt/kwallet_dbus.h"
 
 namespace autofill {
 struct PasswordForm;
 }
 
 namespace base {
 class Pickle;
-class PickleIterator;
 class WaitableEvent;
 }
 
 // NativeBackend implementation using KWallet.
 class NativeBackendKWallet : public PasswordStoreX::NativeBackend {
  public:
   NativeBackendKWallet(LocalProfileId id,
                        base::nix::DesktopEnvironment desktop_env);
 
   ~NativeBackendKWallet() override;
@@ skipping 107 matching lines @@
 
   // The name of the wallet we've opened. Set during Init().
   std::string wallet_name_;
   // The application name (e.g. "Chromium"), shown in KWallet auth dialogs.
   const std::string app_name_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeBackendKWallet);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_NATIVE_BACKEND_KWALLET_X_H_