src/: Update the remaining include paths of string_split.h to its new location.

win8/delegate_execute/delegate_execute_operation.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 "win8/delegate_execute/delegate_execute_operation.h"
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
-#include "base/string_split.h"
+#include "base/strings/string_split.h"
 #include "chrome/common/chrome_switches.h"
 #include "win8/delegate_execute/delegate_execute_util.h"
 
 namespace delegate_execute {
 
 DelegateExecuteOperation::DelegateExecuteOperation()
     : operation_type_(DELEGATE_EXECUTE) {
 }
 
 DelegateExecuteOperation::~DelegateExecuteOperation() {
@@ skipping 29 matching lines @@
   base::SplitString(mutex_, L'.', &parts);
   if (parts.size() != 3)
     return 0;
   DWORD pid;
   if (!base::StringToUint(parts[2], reinterpret_cast<uint32*>(&pid)))
     return 0;
   return pid;
 }
 
 }  // namespace delegate_execute