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

sync/syncable/write_transaction_info.cc

 // Copyright (c) 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/syncable/write_transaction_info.h"
 
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 
 namespace syncer {
 namespace syncable {
 
 WriteTransactionInfo::WriteTransactionInfo(
     int64 id,
     tracked_objects::Location location,
     WriterTag writer,
     ImmutableEntryKernelMutationMap mutations)
     : id(id),
@@ skipping 21 matching lines @@
         new base::StringValue(
             base::Uint64ToString(static_cast<uint64>(mutations_size)) +
             " mutations");
   }
   dict->Set("mutations", mutations_value);
   return dict;
 }
 
 }  // namespace syncable
 }  // namespace syncer