C#: Remove the HttpRequest.RawUrl barrier model.

Author: michaelnebel

csharp/ql/lib/ext/System.Web.model.yml

@@ -1,10 +1,4 @@
 extensions:
-  - addsTo:
-      pack: codeql/csharp-all
-      extensible: barrierModel
-    data:
-      # The RawUrl property is considered to be safe for URL redirects
-      - ["System.Web", "HttpRequest", False, "get_RawUrl", "()", "", "ReturnValue", "url-redirection", "manual"]
   - addsTo:
       pack: codeql/csharp-all
       extensible: sinkModel