Disables HTML notifications when rich notifications are enabled.

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index 48651a7b8370133c3b8fac0b6ab1831db5e609d7..b4e6ea066a21e7b20bff389a5d949c975c15ce79 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -433,6 +433,10 @@ bool ChromeRenderViewObserver::allowWebComponents(const WebDocument& document,
 
 bool ChromeRenderViewObserver::allowHTMLNotifications(
     const WebDocument& document) {
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (command_line->HasSwitch(switches::kDisableHTMLNotifications))
+    return false;
+
   WebSecurityOrigin origin = document.securityOrigin();
   const extensions::Extension* extension = GetExtension(origin);
   return extension && extension->HasAPIPermission(APIPermission::kNotification);