Merge WebUSB notification flag into experimental web platform features.

chrome/browser/chrome_browser_main.cc

Index: chrome/browser/chrome_browser_main.cc
diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index 010d0cbeec7af03358db7dd5723bf48f70341f0d..cb3ca1d2cab8142ad59152d67246f39a1eb87ebe 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1186,8 +1186,10 @@ void ChromeBrowserMainParts::PostBrowserStart() {
 #endif  // defined(ENABLE_WEBRTC)
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
+  // WebUSB is an experimental web API. The sites these notifications will link
+  // to will only work if the experiment is enabled.
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableWebUsbNotifications)) {
+          switches::kEnableExperimentalWebPlatformFeatures)) {
     webusb_browser_client_.reset(new ChromeWebUsbBrowserClient());
     webusb_detector_.reset(
         new webusb::WebUsbDetector(webusb_browser_client_.get()));