Remove remaining legacy SplitString calls.

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/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/win/windows_version.h"
@@ skipping 34 matching lines @@
   else if (cmd_line->HasSwitch(switches::kForceImmersive))
     the_switch = switches::kForceImmersive;
 
   relaunch_flags_ = ParametersFromSwitch(the_switch);
 
   operation_type_ = RELAUNCH_CHROME;
   return true;
 }
 
 base::Process DelegateExecuteOperation::GetParent() const {
-  std::vector<base::string16> parts;
-  base::SplitString(mutex_, L'.', &parts);
+  std::vector<base::StringPiece16> parts = base::SplitStringPiece(
+      mutex_, L".", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   if (parts.size() != 3)
     return base::Process();
   DWORD pid;
   if (!base::StringToUint(parts[2], reinterpret_cast<uint32*>(&pid)))
     return base::Process();
   return base::Process::Open(pid);
 }
 
 }  // namespace delegate_execute