[binding] Replace [CustomIndexedGetter] attributes with [Custom] getter

Source/core/storage/Storage.idl

Index: Source/core/storage/Storage.idl
diff --git a/Source/core/storage/Storage.idl b/Source/core/storage/Storage.idl
index 90ce6371a1690224b1853a26cbd7fe44207d4ccd..9531454e3a32e0fb2e651937d21dbce8a0f13dce 100644
--- a/Source/core/storage/Storage.idl
+++ b/Source/core/storage/Storage.idl
@@ -24,13 +24,14 @@
  */
 
 [
-    CustomDeleteProperty,
     CustomEnumerateProperty,
-    CustomIndexedSetter
 ] interface Storage {
     [RaisesException, ImplementedAs=anonymousIndexedGetter] getter DOMString(unsigned long index);
+    [Custom] deleter boolean (unsigned long index);
+    [Custom] setter boolean (unsigned long index, DOMString value);
     [RaisesException, ImplementedAs=anonymousNamedGetter] getter DOMString(DOMString name);
     [RaisesException, ImplementedAs=anonymousNamedSetter] setter DOMString(DOMString name, DOMString value);
+    [Custom] deleter boolean (DOMString name);
     [NotEnumerable, GetterRaisesException] readonly attribute unsigned long length;
     [NotEnumerable, TreatReturnedNullStringAs=Null, RaisesException] DOMString key(unsigned long index);
     [NotEnumerable, TreatReturnedNullStringAs=Null, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds, RaisesException] DOMString getItem(DOMString key);