IDL: make optional arguments (without default) explicit sometimes

Source/core/css/WebKitCSSMatrix.idl

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 38 matching lines @@
     attribute double m24;
     attribute double m31;
     attribute double m32;
     attribute double m33;
     attribute double m34;
     attribute double m41;
     attribute double m42;
     attribute double m43;
     attribute double m44;
 
-    [RaisesException] void setMatrixValue([Default=Undefined] optional DOMString string);
+    [RaisesException] void setMatrixValue(optional DOMString string);
 
     // Multiply this matrix by secondMatrix, on the right (result = this * secondMatrix)
-    [Immutable] WebKitCSSMatrix multiply([Default=Undefined] optional WebKitCSSMatrix secondMatrix);
+    [Immutable] WebKitCSSMatrix multiply(optional WebKitCSSMatrix secondMatrix);
 
     // Return the inverse of this matrix. Throw an exception if the matrix is not invertible
     [Immutable, RaisesException] WebKitCSSMatrix inverse();
 
     // Return this matrix translated by the passed values.
     // Passing a NaN will use a value of 0. This allows the 3D form to used for 2D operations
-    [Immutable] WebKitCSSMatrix translate([Default=Undefined] optional double x,
-                                          [Default=Undefined] optional double y,
-                                          [Default=Undefined] optional double z);
+    [Immutable] WebKitCSSMatrix translate(optional double x,
+                                          optional double y,
+                                          optional double z);
 
     // Returns this matrix scaled by the passed values.
     // Passing scaleX or scaleZ as NaN uses a value of 1, but passing scaleY of NaN
     // makes it the same as scaleX. This allows the 3D form to used for 2D operations
-    [Immutable] WebKitCSSMatrix scale([Default=Undefined] optional double scaleX,
-                                      [Default=Undefined] optional double scaleY,
-                                      [Default=Undefined] optional double scaleZ);
+    [Immutable] WebKitCSSMatrix scale(optional double scaleX,
+                                      optional double scaleY,
+                                      optional double scaleZ);
 
     // Returns this matrix rotated by the passed values.
     // If rotY and rotZ are NaN, rotate about Z (rotX=0, rotateY=0, rotateZ=rotX).
     // Otherwise use a rotation value of 0 for any passed NaN.
-    [Immutable] WebKitCSSMatrix rotate([Default=Undefined] optional double rotX,
-                                       [Default=Undefined] optional double rotY,
-                                       [Default=Undefined] optional double rotZ);
+    [Immutable] WebKitCSSMatrix rotate(optional double rotX,
+                                       optional double rotY,
+                                       optional double rotZ);
 
     // Returns this matrix rotated about the passed axis by the passed angle.
     // Passing a NaN will use a value of 0. If the axis is (0,0,0) use a value
     // of (0,0,1).
-    [Immutable] WebKitCSSMatrix rotateAxisAngle([Default=Undefined] optional double x,
-                                                [Default=Undefined] optional double y,
-                                                [Default=Undefined] optional double z,
-                                                [Default=Undefined] optional double angle);
+    [Immutable] WebKitCSSMatrix rotateAxisAngle(optional double x,
+                                                optional double y,
+                                                optional double z,
+                                                optional double angle);
 
     // Returns this matrix skewed along the X axis by the passed values.
     // Passing a NaN will use a value of 0.
-    [Immutable] WebKitCSSMatrix skewX([Default=Undefined] optional double angle);
+    [Immutable] WebKitCSSMatrix skewX(optional double angle);
 
     // Returns this matrix skewed along the Y axis by the passed values.
     // Passing a NaN will use a value of 0.
-    [Immutable] WebKitCSSMatrix skewY([Default=Undefined] optional double angle);
+    [Immutable] WebKitCSSMatrix skewY(optional double angle);
 
     [NotEnumerable] stringifier;
 };