Print Preview: Make useCloudPrint a WebUI event

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 1f29ef46a0365da1f6b323b35c20b312c5bece39..3d1f0afe35aaacf98218348f53b9c5b609970b85 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -1437,7 +1437,7 @@ void PrintPreviewHandler::SendCloudPrintEnabled() {
     settings.SetString(kCloudPrintUrl,
                        GURL(cloud_devices::GetCloudPrintURL()).spec());
     settings.SetBoolean(kAppKioskMode, chrome::IsRunningInForcedAppMode());
-    web_ui()->CallJavascriptFunctionUnsafe("setUseCloudPrint", settings);
+    FireWebUIListener("use-cloud-print", settings);

[dpapad, 2017/06/27 18:54:07]

Do we need to package the string and the boolean to a single object anymore?
FireWebUIListener() supports multiple arguments.

[rbpotter, 2017/06/27 22:30:29]

Done.

   }
 }