[Sync] Removing duplicate includes, part 2.

components/sync/syncable/parent_child_index_unittest.cc

 // Copyright (c) 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/sync/syncable/parent_child_index.h"
 
 #include <string>
-#include <vector>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "components/sync/syncable/entry_kernel.h"
 #include "components/sync/syncable/syncable_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace syncable {
 
@@ skipping 492 matching lines @@
   const OrderedChildSet* children = index_.GetChildren(type_root_id);
   ASSERT_TRUE(children);
   EXPECT_EQ(2UL, children->size());
   const OrderedChildSet* children_bad = index_.GetChildren(bad_type_root_id);
   ASSERT_TRUE(children_bad);
   EXPECT_EQ(2UL, children_bad->size());
 }
 
 }  // namespace syncable
 }  // namespace syncer