Remove ScriptCallStack.

third_party/WebKit/Source/modules/websockets/WebSocketChannel.h

 /*
  * Copyright (C) 2009 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
     // Do not call |send| after calling this method.
     virtual void close(int code, const String& reason) = 0;
 
     // Log the reason text and close the connection. Will call didClose().
     // The MessageLevel parameter will be used for the level of the message
     // shown at the devtools console.
     // SourceLocation parameter may be shown with the reason text
     // at the devtools console. Even if location is specified, it may be ignored
     // and the "current" location in the sense of JavaScript execution
     // may be shown if this method is called in a JS execution context.
-    // You can pass null location if unknown.
+    // Location should not be null.
     virtual void fail(const String& reason, MessageLevel, PassOwnPtr<SourceLocation>) = 0;
 
     // Do not call any methods after calling this method.
     virtual void disconnect() = 0; // Will suppress didClose().
 
     virtual ~WebSocketChannel() { }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 };
 
 } // namespace blink
 
 #endif // WebSocketChannel_h