Assertion removed in print_preview_pdf_generated.cc.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index 86ee312de2523d6cdec431d45fdeac0d8f56af72..afe08ac8834e65a2878516646adc6db84aa2b1df 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -278,11 +278,14 @@ void ReportPrintSettingsStats(const base::DictionaryValue& settings) {
 
 // Callback that stores a PDF file on disk.
 void PrintToPdfCallback(printing::Metafile* metafile,
-                        const base::FilePath& path) {
+                        const base::FilePath& path,
+                        const base::Closure* callback_for_test) {
   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
   metafile->SaveTo(path);
   // |metafile| must be deleted on the UI thread.
   BrowserThread::DeleteSoon(BrowserThread::UI, FROM_HERE, metafile);
+  if (callback_for_test)
+    callback_for_test->Run();
 }
 
 std::string GetDefaultPrinterOnFileThread() {
@@ -1372,7 +1375,10 @@ void PrintPreviewHandler::PostPrintToPdfTask() {
   metafile->InitFromData(static_cast<const void*>(data->front()), data->size());
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
-      base::Bind(&PrintToPdfCallback, metafile.release(), print_to_pdf_path_));
+      base::Bind(&PrintToPdfCallback,
+                 metafile.release(),
+                 print_to_pdf_path_,
+                 callback_for_test_));
   print_to_pdf_path_ = base::FilePath();
   ClosePreviewDialog();
 }
@@ -1631,3 +1637,7 @@ void PrintPreviewHandler::UnregisterForMergeSession() {
   if (reconcilor_)
     reconcilor_->RemoveMergeSessionObserver(this);
 }
+
+void PrintPreviewHandler::SetCallbackForTesting(const base::Closure* callback) {
+  callback_for_test_ = callback;
+}