Remove the senderId argument to PushManager.register().

Source/modules/push_messaging/PushManager.h

Index: Source/modules/push_messaging/PushManager.h
diff --git a/Source/modules/push_messaging/PushManager.h b/Source/modules/push_messaging/PushManager.h
index a01895b77e9f186e0a0a44a01f891109450c3053..f136502f01932438914d544247191d935169eedf 100644
--- a/Source/modules/push_messaging/PushManager.h
+++ b/Source/modules/push_messaging/PushManager.h
@@ -7,7 +7,6 @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
-#include "wtf/text/WTFString.h"
 
 namespace blink {
 
@@ -22,7 +21,7 @@ public:
         return new PushManager();
     }
 
-    ScriptPromise registerPushMessaging(ScriptState*, const String& senderId);
+    ScriptPromise registerPushMessaging(ScriptState*);
 
     void trace(Visitor*) { }