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

sync/test/accounts_client/test_accounts_client.cc

 // Copyright 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 "sync/test/accounts_client/test_accounts_client.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop.h"
 #include "base/run_loop.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "net/base/url_util.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "sync/test/accounts_client/url_request_context_getter.h"
 
@@ skipping 126 matching lines @@
     run_loop.QuitClosure(),
     kRequestTimeout);
   run_loop.Run();
 
   if (delegate.success()) {
     *response = delegate.response();
   }
 
   return delegate.success();
 }