Modify StartPhysicalWebDiscovery to take an ios::ChromeBrowserState param

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 d6468b33852e07c45b4d823b7a9486af37ff4a73..43901d15b82902bd84afa527680dc7145cf0b064 100644
--- a/ios/chrome/browser/physical_web/start_physical_web_discovery.h
+++ b/ios/chrome/browser/physical_web/start_physical_web_discovery.h
@@ -7,8 +7,20 @@
 
 #include "components/prefs/pref_service.h"
 
+namespace ios {
+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);
+
 #endif  // IOS_CHROME_BROWSER_PHYSICAL_WEB_START_PHYSICAL_WEB_DISCOVERY_H_