Fix handling default parameters

tools/dom/idl/dart/dart.idl

 // This file introduces / supplements and forces Dart declarations.
 
 [DartSupplemental,
  Constructor]
 interface AudioContext {
   // TODO(ager): Auto-generate this custom method when the info about retaining
   // typed arrays is in the IDL.
   [Custom] void decodeAudioData(ArrayBuffer audioData, AudioBufferCallback successCallback, AudioBufferCallback errorCallback);
 };
 
@@ skipping 51 matching lines @@
   readonly attribute Element nextElementSibling;
   readonly attribute Element previousElementSibling;
 };
 
 [DartSupplemental]
 interface CharacterData {
   readonly attribute Element nextElementSibling;
   readonly attribute Element previousElementSibling;
 };
 
-[DartCallback]
+[Callback]
 interface TimeoutHandler {
   void handleEvent();
 };
 
 // FIXME(leafp): This is a temporary hack to get things running while
 // we are still generating _blink from the dart side idl files.
 // Once we are up and running generating dart:_blink in dartium
 // this should go away.
 [DartSupplemental]
 interface URL {
@@ skipping 163 matching lines @@
   ]
 interface Blob {
 };
 
 [DartSupplemental,
   Constructor(float x, float y)
 ]
 interface WebKitPoint {
 };
 
-[DartSupplemental, DartCallback] // Add missing Callback attribute.
+[DartSupplemental, Callback] // Add missing Callback attribute.
 interface VoidCallback {

[Leaf, 2014/09/09 20:47:28]

This interface is marked callback in the idl, I wonder if we can get rid of it
from here now?

[terry, 2014/09/09 20:58:35]

Good idea I'll look at that post checkin and change if its not required.

On 2014/09/09 20:47:28, leafp wrote:

 };
 
 interface SVGNumber {
   [DartStrictTypeChecking, Custom] attribute float value;
 };
 
 // Keep it in to generate Dart code, C++ implementation is filterd out in generator.
-[
-  DartCallback
-] interface MutationCallback {
+[Callback]
+interface MutationCallback {
   [Custom] boolean handleEvent(MutationRecordArray mutations, MutationObserver observer);
 };
 
 [DartSupplemental,
   CustomConstructor,
   // Provide missing constructor signature.
   Constructor(MutationCallback callback)]
 interface MutationObserver {
 };
 
@@ skipping 180 matching lines @@
     [DartSuppress] void webkitRequestPointerLock();
 };
 
 [DartSupplemental] interface CSSStyleDeclaration {
     // Expose __propertyQuery__  a getter with a special operation in the IDL
     // when used with Custom=PropertyQuery will emit __propertyQuery__.
     [Custom=PropertyQuery] getter boolean (DOMString name);
 };
 
 Element implements GlobalEventHandlers;