[Sync] Refactored ProfileSyncService and remove its backend() function

chrome/browser/sync/profile_sync_service_harness.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/sync/profile_sync_service_harness.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/message_loop.h"
@@ skipping 429 matching lines @@
   LogClientInfo("IsSynced");
   if (service() == NULL)
     return false;
   const SyncSessionSnapshot* snap = GetLastSessionSnapshot();
   // TODO(rsimha): Remove additional checks of snap->has_more_to_sync and
   // snap->unsynced_count once http://crbug.com/48989 is fixed.
   return (snap &&
           snap->num_conflicting_updates == 0 &&  // We can decrypt everything.
           ServiceIsPushingChanges() &&
           GetStatus().notifications_enabled &&
-          !service()->backend()->HasUnsyncedItems() &&
+          !service()->HasUnsyncedItems() &&
           !snap->has_more_to_sync &&
           snap->unsynced_count == 0);
 }
 
 bool ProfileSyncServiceHarness::MatchesOtherClient(
     ProfileSyncServiceHarness* partner) {
   if (!IsSynced())
     return false;
 
   // Only look for a match if we have at least one enabled datatype in
@@ skipping 12 matching lines @@
         partner->GetUpdatedTimestamp(*i) != GetUpdatedTimestamp(*i)) {
       return false;
     }
   }
   return true;
 }
 
 const SyncSessionSnapshot*
     ProfileSyncServiceHarness::GetLastSessionSnapshot() const {
   DCHECK(service_ != NULL) << "Sync service has not yet been set up.";
-  if (service_->backend()) {
-    return service_->backend()->GetLastSessionSnapshot();
+  if (service_->sync_initialized()) {
+    return service_->GetLastSessionSnapshot();
   }
   return NULL;
 }
 
 void ProfileSyncServiceHarness::EnableSyncForDatatype(
     syncable::ModelType datatype) {
   LogClientInfo("EnableSyncForDatatype");
   syncable::ModelTypeSet synced_datatypes;
   if (wait_state_ == SYNC_DISABLED) {
     wait_state_ = WAITING_FOR_ON_BACKEND_INITIALIZED;
@@ skipping 80 matching lines @@
   if (service()) {
     const SyncSessionSnapshot* snap = GetLastSessionSnapshot();
     if (snap) {
       VLOG(1) << "Client " << id_ << ": " << message
               << ": num_updates_downloaded : "
               << snap->syncer_status.num_updates_downloaded_total
               << ", has_more_to_sync: " << snap->has_more_to_sync
               << ", unsynced_count: " << snap->unsynced_count
               << ", num_conflicting_updates: " << snap->num_conflicting_updates
               << ", has_unsynced_items: "
-              << service()->backend()->HasUnsyncedItems()
+              << service()->HasUnsyncedItems()
               << ", observed_passphrase_required: "
               << service()->observed_passphrase_required()
               << ", notifications_enabled: "
               << GetStatus().notifications_enabled
               << ", service_is_pushing_changes: " << ServiceIsPushingChanges();
     } else {
       VLOG(1) << "Client " << id_ << ": " << message
               << ": Sync session snapshot not available.";
     }
   } else {
     VLOG(1) << "Client " << id_ << ": " << message
             << ": Sync service not available.";
   }
 }