Use a direct include of strings headers in base/.

base/process/process_metrics_linux.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 "base/process/process_metrics.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/process/internal_linux.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
 
 namespace {
 
 enum ParsingState {
   KEY_NAME,
   KEY_VALUE
@@ skipping 459 matching lines @@
     if (num_res == 1)
       meminfo->gem_size += mali_size;
   }
 #endif  // defined(ARCH_CPU_ARM_FAMILY)
 #endif  // defined(OS_CHROMEOS)
 
   return true;
 }
 
 }  // namespace base