Add a feature flag for enabling subscription restrictions

chrome/browser/push_messaging/push_messaging_browsertest.cc

Index: chrome/browser/push_messaging/push_messaging_browsertest.cc
diff --git a/chrome/browser/push_messaging/push_messaging_browsertest.cc b/chrome/browser/push_messaging/push_messaging_browsertest.cc
index ba9a28ec93e6ed861b2229fbb466117cf2de64e2..258c2cec5120649b8810ca6b9d1396ccb12bb929 100644
--- a/chrome/browser/push_messaging/push_messaging_browsertest.cc
+++ b/chrome/browser/push_messaging/push_messaging_browsertest.cc
@@ -196,8 +196,10 @@ class PushMessagingBrowserTest : public InProcessBrowserTest {
       const std::string& expected_push_subscription_info,
       bool use_key = true);
 
-  std::string GetEndpointForSubscriptionId(const std::string& subscription_id) {
-    return std::string(kPushMessagingEndpoint) + "/" + subscription_id;
+  std::string GetEndpointForSubscriptionId(const std::string& subscription_id,
+                                           bool standard_protocol = true) {
+    return push_service()->GetEndpoint(standard_protocol).spec() +
+           subscription_id;
   }
 
   PushMessagingAppIdentifier GetAppIdentifierForServiceWorkerRegistration(
@@ -295,8 +297,9 @@ void PushMessagingBrowserTest::TryToSubscribeSuccessfully(
     EXPECT_TRUE(RunScript("documentSubscribePushWithoutKey()", &script_result));
   }
 
-  EXPECT_EQ(GetEndpointForSubscriptionId(expected_push_subscription_info),
-            script_result);
+  EXPECT_EQ(
+      GetEndpointForSubscriptionId(expected_push_subscription_info, use_key),
+      script_result);
 }
 
 PushMessagingAppIdentifier