Use a direct include of strings headers in base/.

base/sys_info_mac.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/sys_info.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreServices/CoreServices.h>
 #include <mach/mach_host.h>
 #include <mach/mach_init.h>
 #include <sys/sysctl.h>
 #include <sys/types.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_mach_port.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 
 namespace base {
 
 // static
 std::string SysInfo::OperatingSystemName() {
   return "Mac OS X";
 }
 
 // static
 std::string SysInfo::OperatingSystemVersion() {
@@ skipping 52 matching lines @@
 // static
 std::string SysInfo::CPUModelName() {
   char name[256];
   size_t len = arraysize(name);
   if (sysctlbyname("machdep.cpu.brand_string", &name, &len, NULL, 0) == 0)
     return name;
   return std::string();
 }
 
 }  // namespace base