Assertion removed in print_preview_pdf_generated.cc.

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 ca10cba403fffd2c3a6bbb5e052661a90d999679..44a6f7cddd19eec4335e691740ff41a24d786f26 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
@@ -621,3 +621,8 @@ void PrintPreviewUI::SetDelegateForTesting(TestingDelegate* delegate) {
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
+
+void PrintPreviewUI::SetCallbackForTesting(
+    const base::Closure* callback) {
+  handler_->SetCallbackForTesting(callback);
+}