Remove the sender_id from the Push API code path.

content/shell/renderer/test_runner/mock_web_push_client.cc

Index: content/shell/renderer/test_runner/mock_web_push_client.cc
diff --git a/content/shell/renderer/test_runner/mock_web_push_client.cc b/content/shell/renderer/test_runner/mock_web_push_client.cc
index efb13838eab27cb549661383ae70a1d9c4f0c164..d2e32afbab611a17f09ccb80516ff8e20456bcd6 100644
--- a/content/shell/renderer/test_runner/mock_web_push_client.cc
+++ b/content/shell/renderer/test_runner/mock_web_push_client.cc
@@ -36,12 +36,12 @@ void MockWebPushClient::SetMockErrorValues(const std::string& message) {
 
 void MockWebPushClient::registerPushMessaging(
     const WebString& sender_id,
-    blink::WebPushRegistrationCallbacks* callbacks) {
-  registerPushMessaging(sender_id, callbacks, NULL);
+    blink::WebPushRegistrationCallbacks* callbacks,
+    blink::WebServiceWorkerProvider* service_worker_provider) {
+  registerPushMessaging(callbacks, service_worker_provider);
 }
 
 void MockWebPushClient::registerPushMessaging(
-    const WebString& sender_id,
     blink::WebPushRegistrationCallbacks* callbacks,
     blink::WebServiceWorkerProvider* service_worker_provider) {
   DCHECK(callbacks);