Disables HTML notifications when rich notifications are enabled.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index f0deebc1fa6c2bb07bcd255d448bc74a923b21ef..3d884c26f9c25bece15ea6e5b6cc432a8523d8ff 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -153,6 +153,10 @@
 #include "chrome/browser/captive_portal/captive_portal_tab_helper.h"
 #endif
 
+#if defined(ENABLE_MESSAGE_CENTER)
+#include "ui/message_center/message_center_util.h"
+#endif
+
 #if defined(OS_ANDROID)
 #include "ui/base/ui_base_paths.h"
 #endif
@@ -1159,6 +1163,11 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
     if (content::IsThreadedCompositingEnabled())
       command_line->AppendSwitch(switches::kEnableThreadedCompositing);
 
+#if defined(ENABLE_MESSAGE_CENTER)
+    if (message_center::IsRichNotificationEnabled())
+      command_line->AppendSwitch(switches::kDisableHTMLNotifications);
+#endif
+
     // Please keep this in alphabetical order.
     static const char* const kSwitchNames[] = {
       switches::kAllowRequestOSFileHandleAPI,