[Sync] Removing duplicate includes, part 2.

components/sync_sessions/tab_node_pool_unittest.cc

 // Copyright 2014 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/sync_sessions/tab_node_pool.h"
 
-#include <stddef.h>
-
 #include <vector>
 
 #include "components/sync/api/sync_change.h"
 #include "components/sync/protocol/session_specifics.pb.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace sync_sessions {
 
 class SyncTabNodePoolTest : public testing::Test {
@@ skipping 236 matching lines @@
   // kFreeNodesLowWatermark.
   pool_.FreeTabNode(last_sync_id, &changes);
   EXPECT_FALSE(pool_.Empty());
   EXPECT_TRUE(pool_.Full());
   EXPECT_EQ(TabNodePool::kFreeNodesLowWatermark, pool_.Capacity());
 }
 
 }  // namespace
 
 }  // namespace sync_sessions