Remove bad CallJavascriptFunctionUnsafe call from PrintPreviewUI

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_ui.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
index 8493e8cc7554c35ed196e4827c17d8c9588094b8..f07d5be1ba4edb44d6baacf67699856693ab55a5 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
@@ -533,13 +533,20 @@ void PrintPreviewUI::OnPrintPreviewDialogClosed() {
 }
 
 void PrintPreviewUI::OnInitiatorClosed() {
+  // Should only get here if the initiator was still tracked by the Print
+  // Preview Dialog Controller, so the print job has not yet been sent.
   WebContents* preview_dialog = web_ui()->GetWebContents();
   printing::BackgroundPrintingManager* background_printing_manager =
       g_browser_process->background_printing_manager();
-  if (background_printing_manager->HasPrintPreviewDialog(preview_dialog))
-    web_ui()->CallJavascriptFunctionUnsafe("cancelPendingPrintRequest");
-  else
+  if (background_printing_manager->HasPrintPreviewDialog(preview_dialog)) {
+    // Dialog is hidden but is still generating the preview. Cancel the print
+    // request as it can't be completed.
+    background_printing_manager->OnPrintRequestCancelled(preview_dialog);
+    handler_->OnPrintRequestCancelled();
+  } else {
+    // Initiator was closed while print preview dialog was still open.
     OnClosePrintPreviewDialog();
+  }
 }
 
 void PrintPreviewUI::OnPrintPreviewCancelled() {