Use a direct include of strings headers in testing/, third_party/, tools/.

tools/android/memdump/memdump.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 <fcntl.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include <algorithm>
 #include <cstring>
 #include <fstream>
 #include <iostream>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/hash_tables.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string_number_conversions.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 
 namespace {
 
 // An entry in /proc/<pid>/pagemap.
 struct PageMapEntry {
   uint64 page_frame_number : 55;
   uint unused : 8;
   uint present : 1;
 };
 
@@ skipping 314 matching lines @@
           &processes_memory[it - pids.begin()];
       process_memory->pid = *it;
       if (!CollectProcessMemoryInformation(page_count_fd, process_memory))
         return EXIT_FAILURE;
     }
   }
   ClassifyPages(&processes_memory);
   DumpProcessesMemoryMaps(processes_memory);
   return EXIT_SUCCESS;
 }