Check if cancelled in prepareDataOnMainThread()

third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp

Index: third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp b/third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp
index cde65e4b2355b3f201fb4d285e913738e4ec73cf..a0407d44ac8b0b10303f49f24b0faae9ec9fe7df 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp
@@ -235,6 +235,11 @@ class SourceStream : public v8::ScriptCompiler::ExternalSourceStream {
   void prepareDataOnMainThread(ScriptStreamer* streamer) {
     DCHECK(isMainThread());
 
+    if (m_cancelled) {
+      m_dataQueue.finish();
+      return;
+    }
+
     // The Resource must still be alive; otherwise we should've cancelled
     // the streaming (if we have cancelled, the background thread is not
     // waiting).