Revert of More System Dialog printing code disabled on Windows.

chrome/browser/ui/webui/print_preview/print_preview_ui.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 "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <vector>
 
 #include "base/id_map.h"
@@ skipping 466 matching lines @@
 }
 
 void PrintPreviewUI::OnPrintPreviewRequest(int request_id) {
   if (!initial_preview_start_time_.is_null()) {
     UMA_HISTOGRAM_TIMES("PrintPreview.InitializationTime",
                         base::TimeTicks::Now() - initial_preview_start_time_);
   }
   g_print_preview_request_id_map.Get().Set(id_, request_id);
 }
 
-#if !defined(OS_WIN)
 void PrintPreviewUI::OnShowSystemDialog() {
   web_ui()->CallJavascriptFunction("onSystemDialogLinkClicked");
 }
-#endif  // !OS_WIN
 
 void PrintPreviewUI::OnDidGetPreviewPageCount(
     const PrintHostMsg_DidGetPreviewPageCount_Params& params) {
   DCHECK_GT(params.page_count, 0);
   if (g_testing_delegate)
     g_testing_delegate->DidGetPreviewPageCount(params.page_count);
   base::FundamentalValue count(params.page_count);
   base::FundamentalValue request_id(params.preview_request_id);
   web_ui()->CallJavascriptFunction("onDidGetPreviewPageCount",
                                    count,
@@ skipping 133 matching lines @@
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }