Use a direct include of strings headers in rlz/, sandbox/, skia/, sql/, sync/.

sync/test/engine/test_directory_setter_upper.cc

 // 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.
 
 #include "sync/test/engine/test_directory_setter_upper.h"
 
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "base/location.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "sync/syncable/directory.h"
 #include "sync/syncable/in_memory_directory_backing_store.h"
 #include "sync/syncable/mutable_entry.h"
 #include "sync/syncable/syncable_read_transaction.h"
 #include "sync/syncable/syncable_write_transaction.h"
 #include "sync/test/test_transaction_observer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
@@ skipping 49 matching lines @@
 void TestDirectorySetterUpper::RunInvariantCheck() {
   // Check invariants for all items.
   syncable::ReadTransaction trans(FROM_HERE, directory());
 
   // The TestUnrecoverableErrorHandler that this directory was constructed with
   // will handle error reporting, so we can safely ignore the return value.
   directory()->FullyCheckTreeInvariants(&trans);
 }
 
 }  // namespace syncer