[Sync] SyncEngine 1.5: Fix all backend references in PSS.

components/precache/content/precache_manager.cc

 // Copyright 2013 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 "components/precache/content/precache_manager.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 81 matching lines @@
          base::StartsWith(
              base::FieldTrialList::FindFullName(kPrecacheFieldTrialName),
              kPrecacheFieldTrialControlGroup, base::CompareCase::SENSITIVE);
 }
 
 bool PrecacheManager::IsPrecachingAllowed() const {
   return PrecachingAllowed() == AllowedType::ALLOWED;
 }
 
 PrecacheManager::AllowedType PrecacheManager::PrecachingAllowed() const {
-  if (!(sync_service_ && sync_service_->IsBackendInitialized()))
+  if (!(sync_service_ && sync_service_->IsEngineInitialized()))
     return AllowedType::PENDING;
 
   // SyncService delegates to SyncPrefs, which must be called on the UI thread.
   if (history_service_ &&
       sync_service_->GetActiveDataTypes().Has(syncer::SESSIONS) &&
       !sync_service_->GetEncryptedDataTypes().Has(syncer::SESSIONS))
     return AllowedType::ALLOWED;
 
   return AllowedType::DISALLOWED;
 }
@@ skipping 62 matching lines @@
     // Calculate TopHosts solely for metrics purposes.
     if (needs_top_hosts) {
       history_service_->TopHosts(
           NumTopHosts(),
           base::Bind(&PrecacheManager::OnHostsReceivedThenDone, AsWeakPtr()));
     } else {
       OnDone();
     }
   } else {
     if (PrecachingAllowed() != AllowedType::PENDING) {
-      // We are not waiting on the sync backend to be initialized. The user
+      // We are not waiting on the sync engine to be initialized. The user
       // either is not in the field trial, or does not have sync enabled.
       // Pretend that precaching started, so that the PrecacheServiceLauncher
       // doesn't try to start it again.
     }
 
     OnDone();
   }
 }
 
 void PrecacheManager::CancelPrecaching() {
@@ skipping 159 matching lines @@
       this));
   precache_fetcher_->Start();
 }
 
 void PrecacheManager::OnHostsReceivedThenDone(
     const history::TopHostsList& host_counts) {
   OnDone();
 }
 
 }  // namespace precache