Assertion removed in print_preview_pdf_generated.cc.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index 4f024968009ce7b116fb59532f41539a15c1892a..6669726b6cf4dc3149503222ac3ef9720a23dc47 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -104,6 +104,9 @@ class PrintPreviewHandler
   int regenerate_preview_request_count() const {
     return regenerate_preview_request_count_;
   }
+  // Sets |pdf_file_saved_callback_| to |callback|. The callback is used to end
+  // the message loop in PrintPreviewObserver in print_preview_pdf_generated.cc.
+  void SetPdfSavedCallbackForTesting(const base::Closure& callback);
 
  private:
   friend class PrintPreviewPdfGeneratedBrowserTest;
@@ -332,6 +335,10 @@ class PrintPreviewHandler
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
+  // Ends message loop for PrintPreviewObserver in
+  // print_preview_pdf_generated.cc.
+  base::Closure pdf_file_saved_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };