IDL compiler: omit header for WindowMediaSource.idl in Python

Source/bindings/tests/idls/TestPartialInterfacePython2.idl

Index: Source/bindings/tests/idls/TestPartialInterfacePython2.idl
diff --git a/Source/bindings/tests/idls/TestPartialInterfacePython2.idl b/Source/bindings/tests/idls/TestPartialInterfacePython2.idl
index 5e1f6de65ef788d353b1a6bd01eefe7d287648da..2bab6e8bcaabb80c6f3ae02be2e6a8e8ad4ad38d 100644
--- a/Source/bindings/tests/idls/TestPartialInterfacePython2.idl
+++ b/Source/bindings/tests/idls/TestPartialInterfacePython2.idl
@@ -30,6 +30,7 @@
 
 [
     ImplementedAs=TestPartialInterfacePythonImplementation,  // Conflicts with default partial interface class name
+    // NoHeader, // FIXME: remove this attribute once switch to Python, as removing; only needed by Python (and not supported by Perl), so no test currently
     // PerContextEnabled=PartialContextName, // Conflicts with [RuntimeEnabled]; test disabled because Perl behavior is wrong for static attributes and methods and only one actual use
 ] partial interface TestInterfacePython {
     const unsigned short PARTIAL2_UNSIGNED_SHORT = 0;