Use a direct include of strings headers in base/.

base/process/internal_linux.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 "base/process/internal_linux.h"
 
 #include <unistd.h>
 
 #include <string>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/logging.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
 namespace internal {
 
 const char kProcDir[] = "/proc";
 
 const char kStatFile[] = "stat";
 
 base::FilePath GetProcPidDir(pid_t pid) {
@@ skipping 106 matching lines @@
   if (!ReadProcStats(pid, &stats_data))
     return 0;
   std::vector<std::string> proc_stats;
   if (!ParseProcStats(stats_data, &proc_stats))
     return 0;
   return GetProcStatsFieldAsSizeT(proc_stats, field_num);
 }
 
 }  // namespace internal
 }  // namespace base