Remove the sender_id from the Push API code path.

chrome/browser/services/gcm/push_messaging_browsertest.cc

Index: chrome/browser/services/gcm/push_messaging_browsertest.cc
diff --git a/chrome/browser/services/gcm/push_messaging_browsertest.cc b/chrome/browser/services/gcm/push_messaging_browsertest.cc
index 46cd0cba38e42a6e3c3b908e7fa2083f329b2026..84333919fde080af242042da96ef0c9300e29d1d 100644
--- a/chrome/browser/services/gcm/push_messaging_browsertest.cc
+++ b/chrome/browser/services/gcm/push_messaging_browsertest.cc
@@ -122,7 +122,7 @@ class PushMessagingBrowserTest : public InProcessBrowserTest {
   }
 
   bool RegisterPush(std::string* result) {
-    return RunScript("registerPush('1234567890')", result);
+    return RunScript("registerPush()", result);
   }
 
   net::SpawnedTestServer* https_server() const { return https_server_.get(); }