make new syncer thread the default.

chrome/browser/sync/sessions/sync_session_context.h

 // Copyright (c) 2011 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. A context is accessible via
 // a SyncSession so that session SyncerCommands and parts of the engine have
 // a convenient way to access other parts. In this way it can be thought of as
 // the surrounding environment for the SyncSession. The components of this
 // environment are either valid or not valid for the entire context lifetime,
@@ skipping 74 matching lines @@
   int32 max_commit_batch_size() const { return max_commit_batch_size_; }
 
   const ModelSafeRoutingInfo& previous_session_routing_info() const {
     return previous_session_routing_info_;
   }
 
   void set_previous_session_routing_info(const ModelSafeRoutingInfo& info) {
     previous_session_routing_info_ = info;
   }
 
-  // TODO(tim): Deprecated.  Bug 26339.
-  sessions::SyncSessionSnapshot* previous_session_snapshot() {
-    return previous_session_snapshot_.get();
-  }
-
-  void set_last_snapshot(const SyncSessionSnapshot& snapshot);
-
   void NotifyListeners(const SyncEngineEvent& event) {
     FOR_EACH_OBSERVER(SyncEngineEventListener, listeners_,
                       OnSyncEngineEvent(event));
   }
 
  private:
   // Rather than force clients to set and null-out various context members, we
   // extend our encapsulation boundary to scoped helpers that take care of this
   // once they are allocated. See definitions of these below.
   friend class ScopedSessionContextConflictResolver;
@@ skipping 54 matching lines @@
  private:
   SyncSessionContext* context_;
   ConflictResolver* resolver_;
   DISALLOW_COPY_AND_ASSIGN(ScopedSessionContextConflictResolver);
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SYNC_SESSION_CONTEXT_H_