Disables HTML notifications when rich notifications are enabled.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 755a2c595b09f2a3b91b64cd8ca22ab22061a9e1..2d5769c8bac2c6b35aa21bf1c2ff1a92fa453089 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -133,6 +133,9 @@ const char kEnableGpuSandbox[]              = "enable-gpu-sandbox";
 // Manager can be used to terminate the offending process in this case.
 const char kDisableHangMonitor[]            = "disable-hang-monitor";
 
+// Disables HTML-based desktop notifications.
+const char kDisableHTMLNotifications[]      = "disable-html-notifications";
+
 // Disable the RenderThread's HistogramCustomizer.
 const char kDisableHistogramCustomizer[]    = "disable-histogram-customizer";