sync: Consistently refcount ModelSafeWorkers

sync/sessions/sync_session_context.h

 // Copyright 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.
 
 // SyncSessionContext encapsulates the contextual information and engine
 // components specific to a SyncSession.  Unlike the SyncSession, the context
 // can be reused across several sync cycles.
 //
 // The context does not take ownership of its pointer members.  It's up to
 // the surrounding classes to ensure those members remain valid while the
@@ skipping 29 matching lines @@
 }
 
 // Default number of items a client can commit in a single message.
 static const int kDefaultMaxCommitBatchSize = 25;
 
 namespace sessions {
 class TestScopedSessionEventListener;
 
 class SYNC_EXPORT_PRIVATE SyncSessionContext {
  public:
-  SyncSessionContext(ServerConnectionManager* connection_manager,
-                     syncable::Directory* directory,
-                     const std::vector<ModelSafeWorker*>& workers,
-                     ExtensionsActivity* extensions_activity,
-                     const std::vector<SyncEngineEventListener*>& listeners,
-                     DebugInfoGetter* debug_info_getter,
-                     TrafficRecorder* traffic_recorder,
-                     bool keystore_encryption_enabled,
-                     bool client_enabled_pre_commit_update_avoidance,
-                     const std::string& invalidator_client_id);
+  SyncSessionContext(
+      ServerConnectionManager* connection_manager,
+      syncable::Directory* directory,
+      const std::vector<scoped_refptr<ModelSafeWorker> >& workers,
+      ExtensionsActivity* extensions_activity,
+      const std::vector<SyncEngineEventListener*>& listeners,
+      DebugInfoGetter* debug_info_getter,
+      TrafficRecorder* traffic_recorder,
+      bool keystore_encryption_enabled,
+      bool client_enabled_pre_commit_update_avoidance,
+      const std::string& invalidator_client_id);
 
   ~SyncSessionContext();
 
   ServerConnectionManager* connection_manager() {
     return connection_manager_;
   }
   syncable::Directory* directory() {
     return directory_;
   }
 
@@ skipping 148 matching lines @@
   // enable the pre-commit update avoidance experiment described above.
   const bool client_enabled_pre_commit_update_avoidance_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSessionContext);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_SYNC_SESSION_CONTEXT_H_