Extend Physical Web iOS auto-enable behavior beyond first launch.

ios/chrome/browser/physical_web/start_physical_web_discovery.mm

Index: ios/chrome/browser/physical_web/start_physical_web_discovery.mm
diff --git a/ios/chrome/browser/physical_web/start_physical_web_discovery.mm b/ios/chrome/browser/physical_web/start_physical_web_discovery.mm
index a61a7652105be59e3e7dba528aabce5d29c9aede..5f51776224f36a599c55e36265a5cb0149d19c0d 100644
--- a/ios/chrome/browser/physical_web/start_physical_web_discovery.mm
+++ b/ios/chrome/browser/physical_web/start_physical_web_discovery.mm
@@ -59,13 +59,11 @@ void StartPhysicalWebDiscovery(PrefService* pref_service,
         default_search_provider->IsGoogleSearchURLWithReplaceableKeyword(
             SearchTermsData());
 
-    bool auto_enable = !is_incognito && location_services_enabled &&
-                       location_authorized && geolocation_eligible &&
-                       google_search_enabled;
-
-    pref_service->SetInteger(prefs::kIosPhysicalWebEnabled,
-                             auto_enable ? physical_web::kPhysicalWebOn
-                                         : physical_web::kPhysicalWebOff);
+    if (!is_incognito && location_services_enabled && location_authorized &&
+        geolocation_eligible && google_search_enabled) {
+      pref_service->SetInteger(prefs::kIosPhysicalWebEnabled,
+                               physical_web::kPhysicalWebOn);
+    }
     preference_state = pref_service->GetInteger(prefs::kIosPhysicalWebEnabled);
   }