Update the remaining references to sys_string_conversions.h to its new location.

remoting/host/continue_window_mac.mm

 // 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/continue_window.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/memory/scoped_nsobject.h"
-#include "base/sys_string_conversions.h"
+#include "base/strings/sys_string_conversions.h"
 #include "remoting/host/ui_strings.h"
 
 typedef remoting::ContinueWindow::ContinueSessionCallback
     ContinueSessionCallback;
 
 // Handles the ContinueWindow.
 @interface ContinueWindowMacController : NSObject {
  @private
   scoped_nsobject<NSMutableArray> shades_;
   scoped_nsobject<NSAlert> continue_alert_;
@@ skipping 138 matching lines @@
   [self hide];
   callback_.Run(false);
 }
 
 - (void)onContinue:(id)sender {
   [self hide];
   callback_.Run(true);
 }
 
 @end