Use a direct include of strings headers in remoting/.

remoting/host/chromoting_param_traits.cc

 // Copyright 2013 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/chromoting_param_traits.h"
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 
 namespace IPC {
 
 // static
 void ParamTraits<webrtc::DesktopVector>::Write(Message* m,
                                                const webrtc::DesktopVector& p) {
   m->WriteInt(p.x());
   m->WriteInt(p.y());
 }
 
@@ skipping 100 matching lines @@
 void ParamTraits<remoting::ScreenResolution>::Log(
     const remoting::ScreenResolution& p,
     std::string* l) {
   l->append(base::StringPrintf("webrtc::ScreenResolution(%d, %d, %d, %d)",
                                p.dimensions().width(), p.dimensions().height(),
                                p.dpi().x(), p.dpi().y()));
 }
 
 }  // namespace IPC