[Sync] Fix namespaces for the sync_sessions component.

components/sync/driver/fake_sync_service.h

 // Copyright 2015 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 COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 #define COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 35 matching lines @@
                             syncer::ModelTypeSet chosen_types) override;
   void SetFirstSetupComplete() override;
   bool IsFirstSetupInProgress() const override;
   std::unique_ptr<SyncSetupInProgressHandle> GetSetupInProgressHandle()
       override;
   bool IsSetupInProgress() const override;
   bool ConfigurationDone() const override;
   const GoogleServiceAuthError& GetAuthError() const override;
   bool HasUnrecoverableError() const override;
   bool IsBackendInitialized() const override;
-  OpenTabsUIDelegate* GetOpenTabsUIDelegate() override;
+  sync_sessions::OpenTabsUIDelegate* GetOpenTabsUIDelegate() override;
   bool IsPassphraseRequiredForDecryption() const override;
   base::Time GetExplicitPassphraseTime() const override;
   bool IsUsingSecondaryPassphrase() const override;
   void EnableEncryptEverything() override;
   bool IsEncryptEverythingEnabled() const override;
   void SetEncryptionPassphrase(const std::string& passphrase,
                                PassphraseType type) override;
   bool SetDecryptionPassphrase(const std::string& passphrase) override;
   bool IsCryptographerReady(
       const syncer::BaseTransaction* trans) const override;
@@ skipping 31 matching lines @@
 
   GoogleServiceAuthError error_;
   GURL sync_service_url_;
   std::string unrecoverable_error_message_;
   std::unique_ptr<syncer::UserShare> user_share_;
 };
 
 }  // namespace sync_driver
 
 #endif  // COMPONENTS_SYNC_DRIVER_FAKE_SYNC_SERVICE_H_