Remove ScriptCallStack.

third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp

 /*
  * Copyright (C) 2011, 2012 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 133 matching lines @@
     ASSERT(m_bridge);
     m_bridge->close(code, reason);
 }
 
 void WorkerWebSocketChannel::fail(const String& reason, MessageLevel level, PassOwnPtr<SourceLocation> location)
 {
     if (!m_bridge)
         return;
 
     OwnPtr<SourceLocation> capturedLocation = SourceLocation::capture();
-    if (!capturedLocation->isEmpty()) {
+    if (!capturedLocation->isUnknown()) {
         // If we are in JavaScript context, use the current location instead
         // of passed one - it's more precise.
         m_bridge->fail(reason, level, std::move(capturedLocation));
-    } else if (!location || location->isEmpty()) {
+    } else if (location->isUnknown()) {
         // No information is specified by the caller - use the url
         // and the line number at the connection.
         m_bridge->fail(reason, level, m_locationAtConnection->clone());
     } else {
         // Use the specified information.
         m_bridge->fail(reason, level, std::move(location));
     }
 }
 
 void WorkerWebSocketChannel::disconnect()
@@ skipping 302 matching lines @@
 
 DEFINE_TRACE(Bridge)
 {
     visitor->trace(m_client);
     visitor->trace(m_workerGlobalScope);
     visitor->trace(m_syncHelper);
     visitor->trace(m_peer);
 }
 
 } // namespace blink