Remove ScriptCallStack.

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

Index: third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp
diff --git a/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp b/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp
index 24854f94ee8885417257b5db09672fcfdb7fc13c..50bba63302bd43bdae2121cf5c017139ff0d082a 100644
--- a/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp
+++ b/third_party/WebKit/Source/modules/websockets/WorkerWebSocketChannel.cpp
@@ -151,11 +151,11 @@ void WorkerWebSocketChannel::fail(const String& reason, MessageLevel level, Pass
         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());