[Sync] SyncEngine refactor part 1: interfaces.

chrome/service/cloud_print/cloud_print_proxy_backend.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_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
 
 #include <list>
 #include <string>
 
@@ skipping 29 matching lines @@
   // The print system could not be initialized.
   virtual void OnPrintSystemUnavailable() = 0;
   // Receive auth token and list of printers.
   virtual void OnUnregisterPrinters(
       const std::string& auth_token,
       const std::list<std::string>& printer_ids) = 0;
   // Update and store service settings.
   virtual void OnXmppPingUpdated(int ping_timeout) = 0;
 
  protected:
-  // Don't delete through SyncFrontend interface.
+  // Don't delete through CloudPrintProxyFrontend interface.
   virtual ~CloudPrintProxyFrontend() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyFrontend);
 };
 
 class CloudPrintProxyBackend {
  public:
   CloudPrintProxyBackend(CloudPrintProxyFrontend* frontend,
                          const ConnectorSettings& settings,
@@ skipping 11 matching lines @@
   bool InitializeWithRobotAuthCode(const std::string& robot_oauth_auth_code,
                                    const std::string& robot_email);
   void Shutdown();
   void RegisterPrinters(const printing::PrinterList& printer_list);
   void UnregisterPrinters();
 
  private:
   bool PostCoreTask(const tracked_objects::Location& from_here,
                     const base::Closure& task);
 
-  // The real guts of SyncBackendHost, to keep the public client API clean.
+  // The real guts of CloudPrintProxyBackend, to keep the public client API
+  // clean.
   class Core;
 
   // A thread dedicated for use to perform initialization and authentication.
   base::Thread core_thread_;
 
   // The core, which communicates with AuthWatcher for GAIA authentication and
   // which contains printer registration code.
   scoped_refptr<Core> core_;
 
   // A reference to the TaskRunner used to construct |this|, so we know how to
-  // safely talk back to the SyncFrontend.
+  // safely talk back to the CloudPrintProxyFrontend.
   const scoped_refptr<base::SingleThreadTaskRunner> frontend_task_runner_;
 
   // The frontend which is responsible for displaying UI and updating Prefs.
   // Outlives this backend.
   CloudPrintProxyFrontend* const frontend_;
 
   friend class base::RefCountedThreadSafe<CloudPrintProxyBackend::Core>;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyBackend);
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_