Cleanup [RuntimeEnabled] use in Window

Source/core/frame/Window.idl

Index: Source/core/frame/Window.idl
diff --git a/Source/core/frame/Window.idl b/Source/core/frame/Window.idl
index 70ce11219b4233b31f9b6e19c630311bebe01aa7..a6ff814fa9668a71d8821f68bb2900e004f09f56 100644
--- a/Source/core/frame/Window.idl
+++ b/Source/core/frame/Window.idl
@@ -96,17 +96,14 @@
     readonly attribute long pageXOffset;
     readonly attribute long pageYOffset;
 
-    // FIXME: should be:
-    // void scrollBy(long x, long y);
-    // [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollBy(long x, long y, optional Dictionary scrollOptions);
-    // void scrollTo(long x, long y);
-    // [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scrollTo(long x, long y, optional Dictionary scrollOptions);
-    // void scroll(long x, long y);
-    // [RuntimeEnabled=CSSOMSmoothScroll, RaisesException] void scroll(long x, long y, optional Dictionary scrollOptions);
-    // http://crbug.com/339000
-    [RaisesException] void scrollBy(long x, long y, optional Dictionary scrollOptions);
-    [RaisesException] void scrollTo(long x, long y, optional Dictionary scrollOptions);
-    [RaisesException] void scroll(long x, long y, optional Dictionary scrollOptions);
+    // 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.