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

chrome/test/webdriver/frame_path.cc

 // Copyright (c) 2011 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/test/webdriver/frame_path.h"
 
-#include "base/string_split.h"
+#include "base/strings/string_split.h"
 
 namespace webdriver {
 
 FramePath::FramePath() : path_("") {}
 
 FramePath::FramePath(const FramePath& other) : path_(other.path_) {}
 
 FramePath::FramePath(const std::string& path) : path_(path) {}
 
 FramePath::~FramePath() {}
@@ skipping 48 matching lines @@
 
 bool FramePath::IsSubframe() const {
   return path_.length();
 }
 
 const std::string& FramePath::value() const {
   return path_;
 }
 
 }  // namespace webdriver