Enable websocket filtering via SubresourceFilter

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

Index: third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h
diff --git a/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h b/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h
index 90eb1f2ce555da3e8a36938d50a62190decfb3a3..db14748e952b086c06ea5289a497ebc841fe39af 100644
--- a/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h
+++ b/third_party/WebKit/Source/modules/websockets/DocumentWebSocketChannel.h
@@ -155,6 +155,13 @@ class MODULES_EXPORT DocumentWebSocketChannel final
   void didFinishLoadingBlob(DOMArrayBuffer*);
   void didFailLoadingBlob(FileError::ErrorCode);
 
+  void failWithClosureCode(unsigned short code,
+                           const String& reason,
+                           MessageLevel,
+                           std::unique_ptr<SourceLocation>);
+
+  bool shouldFilterConnection(const KURL&);
+
   // m_handle is a handle of the connection.
   // m_handle == 0 means this channel is closed.
   std::unique_ptr<WebSocketHandle> m_handle;