chrome: Update include paths of string_split.h to its new location.

chrome/browser/nacl_host/nacl_browser.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 "chrome/browser/nacl_host/nacl_browser.h"
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/pickle.h"
-#include "base/string_split.h"
+#include "base/strings/string_split.h"
 #include "base/win/windows_version.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_paths_internal.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/common/url_pattern.h"
 #include "googleurl/src/gurl.h"
 
 namespace {
@@ skipping 441 matching lines @@
     // because it can degrade the responsiveness of the browser.
     // The task is sequenced so that multiple writes happen in order.
     content::BrowserThread::PostBlockingPoolSequencedTask(
         kValidationCacheSequenceName,
         FROM_HERE,
         base::Bind(WriteCache, validation_cache_file_path_,
                    base::Owned(pickle)));
   }
   validation_cache_is_modified_ = false;
 }