Use a direct include of strings headers in remoting/.

remoting/host/register_support_host_request_unittest.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 "remoting/host/register_support_host_request.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
 #include "base/observer_list.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "remoting/base/constants.h"
 #include "remoting/base/rsa_key_pair.h"
 #include "remoting/base/test_rsa_key_pair.h"
 #include "remoting/host/in_memory_host_config.h"
 #include "remoting/jingle_glue/iq_sender.h"
 #include "remoting/jingle_glue/mock_objects.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
 #include "third_party/libjingle/source/talk/xmpp/constants.h"
@@ skipping 134 matching lines @@
   while ((listener = it.GetNext()) != NULL) {
     if (listener->OnSignalStrategyIncomingStanza(response.get()))
       consumed++;
   }
   EXPECT_EQ(1, consumed);
 
   message_loop_.RunUntilIdle();
 }
 
 }  // namespace remoting