Rename 'ScalarValueString' to 'USVString' to match Web IDL

Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl

Index: Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl
diff --git a/Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl b/Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl
index 246f5516054fe27d6b4aa5c8646bd614b3ff533a..2153167550349ee139d5c481b92d9d5912c04b83 100644
--- a/Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl
+++ b/Source/bindings/tests/idls/core/TestInterfaceConstructor4.idl
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Test for overload resolution for the string-like ScalarValueString
+// Test for overload resolution for the string-like USVString
 // argument.
 [
     Constructor(TestInterfaceConstructor4 testInterface4Arg),
-    Constructor(ScalarValueString scalarValueStringArg),
+    Constructor(USVString usvStringArg),
 ] interface TestInterfaceConstructor4 {
 };