Add [NoImplHeader] extended attribute

Source/core/testing/PartialPrivateScriptTest.idl

Index: Source/core/testing/PartialPrivateScriptTest.idl
diff --git a/Source/core/testing/PartialPrivateScriptTest.idl b/Source/core/testing/PartialPrivateScriptTest.idl
index b19d17f6139ff41d48f79873145374ae672d0fa3..51757748fe5ea9d38c3171ceff653fe36be5bde8 100644
--- a/Source/core/testing/PartialPrivateScriptTest.idl
+++ b/Source/core/testing/PartialPrivateScriptTest.idl
@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-partial interface PrivateScriptTest {
+[
+    NoImplHeader
+] partial interface PrivateScriptTest {
     [ImplementedInPrivateScript] short addIntegerInPartial(short value1, short value2);
     [ImplementedInPrivateScript] short addInteger2InPartial(short value1, short value2);
     [ImplementedInPrivateScript] attribute DOMString stringAttributeInPartial;