Use a direct include of strings headers in base/.

base/process/process_iterator_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_iterator.h"
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/process/internal_linux.h"
 #include "base/process_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/threading/thread_restrictions.h"
 
 namespace base {
 
 namespace {
 
 // Reads the |field_num|th field from |proc_stats|.
 // Returns an empty string on failure.
 // This version only handles VM_COMM and VM_STATE, which are the only fields
 // that are strings.
@@ skipping 107 matching lines @@
   return true;
 }
 
 bool NamedProcessIterator::IncludeEntry() {
   if (executable_name_ != entry().exe_file())
     return false;
   return ProcessIterator::IncludeEntry();
 }
 
 }  // namespace base