IDL: make optional arguments (without default) explicit sometimes

Source/core/frame/Window.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google 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
@@ skipping 55 matching lines @@
     [RuntimeEnabled=ShowModalDialog, Custom] any showModalDialog(DOMString url,
                                        optional any dialogArgs,
                                        optional DOMString featureArgs);
 
     void alert();
     void alert(DOMString message);
     boolean confirm(optional DOMString message = "");
     DOMString? prompt(optional DOMString message = "",
                       optional DOMString defaultValue = "");
 
-    boolean find([Default=Undefined] optional DOMString string,
-                 [Default=Undefined] optional boolean caseSensitive,
-                 [Default=Undefined] optional boolean backwards,
-                 [Default=Undefined] optional boolean wrap,
-                 [Default=Undefined] optional boolean wholeWord,
-                 [Default=Undefined] optional boolean searchInFrames,
-                 [Default=Undefined] optional boolean showDialog);
+    boolean find(optional DOMString string,
+                 optional boolean caseSensitive,
+                 optional boolean backwards,
+                 optional boolean wrap,
+                 optional boolean wholeWord,
+                 optional boolean searchInFrames,
+                 optional boolean showDialog);
 
     [Replaceable, MeasureAs=WindowOffscreenBuffering] readonly attribute boolean offscreenBuffering;
 
     [Replaceable] readonly attribute long outerHeight;
     [Replaceable] readonly attribute long outerWidth;
     [Replaceable] readonly attribute long innerHeight;
     [Replaceable] readonly attribute long innerWidth;
     [Replaceable] readonly attribute long screenX;
     [Replaceable] readonly attribute long screenY;
     [Replaceable] readonly attribute long screenLeft;
     [Replaceable] readonly attribute long screenTop;
     [Replaceable] readonly attribute long scrollX;
     [Replaceable] readonly attribute long scrollY;
     readonly attribute long pageXOffset;
     readonly attribute long pageYOffset;
 
     // Overloading can be replaced by optional if RuntimeEnabled is removed, by
     // changing the third argument to *optional* Dictionary scrollOptions
     void scrollBy(long x, long y);
     [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollBy(long x, long y, Dictionary scrollOptions);
     void scrollTo(long x, long y);
     [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollTo(long x, long y, Dictionary scrollOptions);
     void scroll(long x, long y);
     [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scroll(long x, long y, Dictionary scrollOptions);
-    void moveBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
-    void moveTo([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
-    void resizeBy([Default=Undefined] optional float x, [Default=Undefined] optional float y); // FIXME: this should take longs not floats.
-    void resizeTo([Default=Undefined] optional float width, [Default=Undefined] optional float height); // FIXME: this should take longs not floats.
+    void moveBy(optional float x, optional float y); // FIXME: this should take longs not floats.
+    void moveTo(optional float x, optional float y); // FIXME: this should take longs not floats.
+    void resizeBy(optional float x, optional float y); // FIXME: this should take longs not floats.
+    void resizeTo(optional float width, optional float height); // FIXME: this should take longs not floats.
 
     [DoNotCheckSecurity] readonly attribute boolean closed;
 
     [Replaceable, DoNotCheckSecurity] readonly attribute unsigned long length;
 
     attribute DOMString name;
 
     attribute DOMString status;
     [MeasureAs=WindowDefaultStatus] attribute DOMString defaultStatus;
     // This attribute is an alias of defaultStatus and is necessary for legacy uses.
@@ skipping 11 matching lines @@
     // DOM Level 2 AbstractView Interface
     readonly attribute Document document;
 
     // CSSOM View Module
     MediaQueryList matchMedia(DOMString query);
 
     // styleMedia has been removed from the CSSOM View specification.
     readonly attribute StyleMedia styleMedia;
 
     // DOM Level 2 Style Interface
-    CSSStyleDeclaration getComputedStyle([Default=Undefined] optional Element element,
-                                         [TreatUndefinedAs=NullString, Default=Undefined] optional DOMString? pseudoElement);
+    CSSStyleDeclaration getComputedStyle(optional Element element,
+                                         [TreatUndefinedAs=NullString] optional DOMString? pseudoElement);
 
     // WebKit extensions
-    [MeasureAs=GetMatchedCSSRules] CSSRuleList getMatchedCSSRules([Default=Undefined] optional Element element,
-                                                                  [TreatUndefinedAs=NullString, Default=Undefined] optional DOMString? pseudoElement);
+    [MeasureAs=GetMatchedCSSRules] CSSRuleList getMatchedCSSRules(optional Element element,
+                                                                  [TreatUndefinedAs=NullString] optional DOMString? pseudoElement);
 
     [Replaceable] readonly attribute double devicePixelRatio;
 
     [RuntimeEnabled=ApplicationCache, LogActivity=GetterOnly] readonly attribute ApplicationCache applicationCache;
 
     [RuntimeEnabled=SessionStorage, LogActivity=GetterOnly, RaisesException=Getter] readonly attribute Storage sessionStorage;
     [RuntimeEnabled=LocalStorage, LogActivity=GetterOnly, RaisesException=Getter] readonly attribute Storage localStorage;
 
     // This is the interface orientation in degrees. Some examples are:
     //  0 is straight up; -90 is when the device is rotated 90 clockwise;
@@ skipping 60 matching lines @@
 // FIXME: make this typedef accurate once enough of http://crbug.com/240176
 // is in place.
 // FIXME: consider putting this typedef in an .idl file containing spec-wide
 // utility type definitions.
 typedef MessagePort Transferable;
 
 Window implements GlobalEventHandlers;
 Window implements WindowBase64;
 Window implements WindowEventHandlers;
 Window implements WindowTimers;