Update the remaining references to sys_string_conversions.h to its new location.

rlz/mac/lib/rlz_value_store_mac.mm

 // 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 "rlz/mac/lib/rlz_value_store_mac.h"
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
-#include "base/sys_string_conversions.h"
+#include "base/strings/sys_string_conversions.h"
 #include "rlz/lib/assert.h"
 #include "rlz/lib/lib_values.h"
 #include "rlz/lib/recursive_cross_process_lock_posix.h"
 #include "rlz/lib/rlz_lib.h"
 
 #import <Foundation/Foundation.h>
 #include <pthread.h>
 
 using base::mac::ObjCCast;
 
@@ skipping 343 matching lines @@
 
 std::string RlzStoreFilenameStr() {
   @autoreleasepool {
     return std::string([RlzPlistFilename() fileSystemRepresentation]);
   }
 }
 
 }  // namespace testing
 
 }  // namespace rlz_lib