Use document from preview for System Dialog printing on Windows.

chrome/renderer/chrome_mock_render_thread.h

Index: chrome/renderer/chrome_mock_render_thread.h
diff --git a/chrome/renderer/chrome_mock_render_thread.h b/chrome/renderer/chrome_mock_render_thread.h
index f9e88f8088f3ee3cd148943056f696412192c2cc..72a8f2a66df9a4236b20543380eb5e035d8e6c5e 100644
--- a/chrome/renderer/chrome_mock_render_thread.h
+++ b/chrome/renderer/chrome_mock_render_thread.h
@@ -96,7 +96,8 @@ class ChromeMockRenderThread : public content::MockRenderThread {
   // For print preview, PrintWebViewHelper will update settings.
   void OnUpdatePrintSettings(int document_cookie,
                              const base::DictionaryValue& job_settings,
-                             PrintMsg_PrintPages_Params* params);
+                             PrintMsg_PrintPages_Params* params,
+                             bool* canceled);
 
   // A mock printer device used for printing tests.
   scoped_ptr<MockPrinter> printer_;