Merge WebUSB notification flag into experimental web platform features.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 8b2b5c31e73fe34690e4d4944bcc065b45cd84f1..8e80903dab69a34b2348f01fbdd61e5aff2d5755 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -556,10 +556,6 @@ const char kEnableWebAppFrame[] = "enable-web-app-frame";
 const char kEnableWebNotificationCustomLayouts[] =
     "enable-web-notification-custom-layouts";
 
-// Enables webusb notifications, which shows notifications when usb devices with
-// landing page are plugged in.
-const char kEnableWebUsbNotifications[] = "enable-webusb-notifications";
-
 // Bypasses the WebUSB permission prompt as it is not yet implemented.
 // crbug.com/529950
 const char kEnableWebUsbOnAnyOrigin[] = "enable-webusb-on-any-origin";