Use a direct include of strings headers in chrome/app/.

chrome/app/hard_error_handler_win.cc

 // Copyright (c) 2009 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/app/hard_error_handler_win.h"
 
 #if defined(_WIN32_WINNT_WIN8) && _MSC_VER < 1700
 // The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h, and in
 // delayimp.h previous to VS2012.
 #undef FACILITY_VISUALCPP
 #endif
 #include <DelayIMP.h>
 #include <winternl.h>
 
 #include "base/basictypes.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "chrome/common/env_vars.h"
 
 namespace {
 const DWORD kExceptionModuleNotFound = VcppException(ERROR_SEVERITY_ERROR,
                                                      ERROR_MOD_NOT_FOUND);
 const DWORD kExceptionEntryPtNotFound = VcppException(ERROR_SEVERITY_ERROR,
                                                       ERROR_PROC_NOT_FOUND);
 // This is defined in <ntstatus.h> but we can't include this file here.
 const DWORD FACILITY_GRAPHICS_KERNEL = 0x1E;
 const DWORD NT_STATUS_ENTRYPOINT_NOT_FOUND = 0xC0000139;
@@ skipping 78 matching lines @@
   } else if (FacilityFromException(exception) == FACILITY_GRAPHICS_KERNEL) {
 #if defined(USE_AURA)
     RaiseHardErrorMsg(exception, std::string(), std::string());
     return true;
 #else
     return false;
 #endif
   }
   return false;
 }