Modify Physical Web auto-optin behavior on Chrome for iOS

ios/chrome/browser/physical_web/start_physical_web_discovery.h

Index: ios/chrome/browser/physical_web/start_physical_web_discovery.h
diff --git a/ios/chrome/browser/physical_web/start_physical_web_discovery.h b/ios/chrome/browser/physical_web/start_physical_web_discovery.h
index 43901d15b82902bd84afa527680dc7145cf0b064..65e4981dcedda887a03c4c0db7840459bc1a8c05 100644
--- a/ios/chrome/browser/physical_web/start_physical_web_discovery.h
+++ b/ios/chrome/browser/physical_web/start_physical_web_discovery.h
@@ -13,13 +13,6 @@ class ChromeBrowserState;
 
 // Checks the environment and starts Physical Web discovery if the required
 // conditions are met.
-// Deprecated, use the version below that takes an ios::ChromeBrowserState.
-// TODO(mattreynolds): remove once downstream users have been switched to the
-// new method.
-void StartPhysicalWebDiscovery(PrefService* pref_service, bool is_incognito);
-
-// Checks the environment and starts Physical Web discovery if the required
-// conditions are met.
 void StartPhysicalWebDiscovery(PrefService* pref_service,
                                ios::ChromeBrowserState* browser_state);