Use a direct include of strings headers in chrome_frame/.

chrome_frame/crash_reporting/nt_loader_unittest.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_frame/crash_reporting/nt_loader.h"
 
 #include <tlhelp32.h>
 #include <winnt.h>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
 #include "base/win/scoped_handle.h"
 #include "chrome_frame/crash_reporting/crash_dll.h"
 #include "gtest/gtest.h"
 
 namespace {
 void AssertIsCriticalSection(CRITICAL_SECTION* critsec) {
   // Assert on some of the internals of the debug info if it has one.
@@ skipping 286 matching lines @@
 
   exceptions_handled = 0;
   set_exception_function(OnCrashDuringUnloadLibrary);
 
   // We should crash during unload.
   if (module != NULL)
     ::FreeLibrary(module);
 
   EXPECT_EQ(1, exceptions_handled);
 }