Print Preview: change getPreview to cr.sendWithPromise

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 830867348cac1bc11660166acbae791d8ea8786a..a221911f9e59564265611aeae152d239c3ebc704 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
@@ -619,23 +619,19 @@ void PrintPreviewUI::OnPreviewDataIsAvailable(int expected_pages_count,
         handler_->regenerate_preview_request_count());
     initial_preview_start_time_ = base::TimeTicks();
   }
-  base::Value ui_identifier(id_);
-  base::Value ui_preview_request_id(preview_request_id);
-  web_ui()->CallJavascriptFunctionUnsafe("updatePrintPreview", ui_identifier,
-                                         ui_preview_request_id);
+  handler_->OnPrintPreviewReady(id_, preview_request_id);
 }
 
 void PrintPreviewUI::OnCancelPendingPreviewRequest() {
   g_print_preview_request_id_map.Get().Set(id_, -1);
 }
 
-void PrintPreviewUI::OnPrintPreviewFailed() {
-  handler_->OnPrintPreviewFailed();
-  web_ui()->CallJavascriptFunctionUnsafe("printPreviewFailed");
+void PrintPreviewUI::OnPrintPreviewFailed(int request_id) {
+  handler_->OnPrintPreviewFailed(request_id);
 }
 
-void PrintPreviewUI::OnInvalidPrinterSettings() {
-  web_ui()->CallJavascriptFunctionUnsafe("invalidPrinterSettings");
+void PrintPreviewUI::OnInvalidPrinterSettings(int request_id) {
+  handler_->OnInvalidPrinterSettings(request_id);
 }
 
 void PrintPreviewUI::OnHidePreviewDialog() {