Clean up a few more unused globals.

chrome/browser/sync/sessions2/tab_node_pool2.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 "chrome/browser/sync/sessions2/tab_node_pool2.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "sync/api/sync_change.h"
 #include "sync/api/sync_data.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/protocol/session_specifics.pb.h"
 #include "sync/protocol/sync.pb.h"
 
 namespace browser_sync {
 
-static const char kNoSessionsFolderError[] =
-    "Server did not create the top-level sessions node. We "
-    "might be running against an out-of-date server.";
-
 const size_t TabNodePool2::kFreeNodesLowWatermark = 25;
 const size_t TabNodePool2::kFreeNodesHighWatermark = 100;
 
 TabNodePool2::TabNodePool2()
     : max_used_tab_node_id_(kInvalidTabNodeID) {}
 
 // static
 // We start vending tab node IDs at 0.
 const int TabNodePool2::kInvalidTabNodeID = -1;
 
@@ skipping 153 matching lines @@
 
 bool TabNodePool2::Empty() const { return free_nodes_pool_.empty(); }
 
 bool TabNodePool2::Full() { return nodeid_tabid_map_.empty(); }
 
 void TabNodePool2::SetMachineTag(const std::string& machine_tag) {
   machine_tag_ = machine_tag;
 }
 
 }  // namespace browser_sync