Assertion removed in print_preview_pdf_generated.cc.

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 <string>
 
 #include "base/files/file_path.h"
@@ skipping 87 matching lines @@
       const local_discovery::PrivetLocalPrintOperation*
       print_operation) OVERRIDE;
   virtual void OnPrivetPrintingError(
       const local_discovery::PrivetLocalPrintOperation* print_operation,
         int http_code) OVERRIDE;
 #endif  // ENABLE_SERVICE_DISCOVERY
   int regenerate_preview_request_count() const {
     return regenerate_preview_request_count_;
   }
 
+  void SetCallbackForTesting(const base::Closure* callback);
+
  private:
   friend class PrintPreviewPdfGeneratedBrowserTest;
   FRIEND_TEST_ALL_PREFIXES(PrintPreviewPdfGeneratedBrowserTest,
                            MANUAL_DummyTest);
   class AccessTokenService;
 
   static bool PrivetPrintingEnabled();
 
   content::WebContents* preview_web_contents() const;
 
@@ skipping 207 matching lines @@
   scoped_ptr<local_discovery::PrivetHTTPResolution> privet_http_resolution_;
   scoped_ptr<local_discovery::PrivetV1HTTPClient> privet_http_client_;
   scoped_ptr<local_discovery::PrivetJSONOperation>
       privet_capabilities_operation_;
   scoped_ptr<local_discovery::PrivetLocalPrintOperation>
       privet_local_print_operation_;
 #endif
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
+  // Callback function to end message loops for observers of the print preview
+  // UI.
+  const base::Closure* callback_for_test_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_