Nuke CanvasPixelArray as it is dropped from WebKit as well.

lib/dom/idl/dart/dart.idl

Index: lib/dom/idl/dart/dart.idl
diff --git a/lib/dom/idl/dart/dart.idl b/lib/dom/idl/dart/dart.idl
index 2876df79f7426b47c486e54fcd65a3c1cc9203cd..934e09565708820d4bea6ab3a86135f0669168d5 100644
--- a/lib/dom/idl/dart/dart.idl
+++ b/lib/dom/idl/dart/dart.idl
@@ -8,7 +8,6 @@ module default {
   MediaList implements sequence<DOMString>;
   StyleSheetList implements sequence<StyleSheet>;
   TouchList implements sequence<Touch>;
-  CanvasPixelArray implements sequence<int>;
 
   Float32Array implements sequence<double>;
   Float64Array implements sequence<double>;
@@ -200,11 +199,6 @@ module canvas {
     [Suppressed] void set();
     [DartName=setElements, Custom] void set(in any array, in optional unsigned long offset);
   };
-
-  [NumericIndexedGetter, CustomIndexedSetter]
-  interface CanvasPixelArray {
-    readonly attribute long length;
-  };
 };
 
 module storage {