Remove bad CallJavascriptFunctionUnsafe call from PrintPreviewUI

chrome/browser/ui/webui/print_preview/print_preview_handler.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <memory>
 #include <queue>
 #include <string>
@@ skipping 68 matching lines @@
 
   // Called when print preview is cancelled due to a new request.
   void OnPrintPreviewCancelled();
 
   // Called when printer settings were invalid.
   void OnInvalidPrinterSettings();
 
   // Called when print preview is ready.
   void OnPrintPreviewReady(int preview_uid, int request_id);
 
+  // Called when a print request is cancelled due to its initiator closing.
+  void OnPrintRequestCancelled();
+
   // Send the print preset options from the document.
   void SendPrintPresetOptions(bool disable_scaling, int copies, int duplex);
 
   // Send the print preview page count and fit to page scaling
   void SendPageCountReady(int page_count,
                           int request_id,
                           int fit_to_page_scaling);
 
   // Send the default page layout
   void SendPageLayoutReady(const base::DictionaryValue& layout,
@@ skipping 369 matching lines @@
   // Proxy for calls to the print backend.  Lazily initialized since web_ui() is
   // not available at construction time.
   std::unique_ptr<printing::PrinterBackendProxy> printer_backend_proxy_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_