Make default argument to Iterable.join be "".

sdk/lib/svg/dart2js/svg_dart2js.dart

 library dart.dom.svg;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:_js_helper' show Creates, Returns, JavaScriptIndexingBehavior, JSName;
 import 'dart:_foreign_helper' show JS;
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
@@ skipping 3024 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, Length)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(Length element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(Length element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(Length element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<Length> where(bool f(Length element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(Length element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 624 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, Number)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(Number element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(Number element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(Number element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<Number> where(bool f(Number element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(Number element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 855 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, PathSeg)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(PathSeg element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(PathSeg element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(PathSeg element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<PathSeg> where(bool f(PathSeg element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(PathSeg element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 885 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, String)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(String element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(String element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(String element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<String> where(bool f(String element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(String element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 1158 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, Transform)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(Transform element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(Transform element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(Transform element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<Transform> where(bool f(Transform element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(Transform element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 517 matching lines @@
   }
 
   dynamic fold(dynamic initialValue, dynamic combine(dynamic, ElementInstance)) {
     return IterableMixinWorkaround.fold(this, initialValue, combine);
   }
 
   bool contains(ElementInstance element) => IterableMixinWorkaround.contains(this, element);
 
   void forEach(void f(ElementInstance element)) => IterableMixinWorkaround.forEach(this, f);
 
-  String join([String separator]) =>
+  String join([String separator = ""]) =>
       IterableMixinWorkaround.joinList(this, separator);
 
   Iterable map(f(ElementInstance element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
   Iterable<ElementInstance> where(bool f(ElementInstance element)) =>
       IterableMixinWorkaround.where(this, f);
 
   Iterable expand(Iterable f(ElementInstance element)) =>
       IterableMixinWorkaround.expand(this, f);
@@ skipping 431 matching lines @@
 
 
 @DocsEditable
 @DomName('SVGVKernElement')
 abstract class _SVGVKernElement extends SvgElement native "*SVGVKernElement" {
 
   @DomName('SVGVKernElement.SVGVKernElement')
   @DocsEditable
   factory _SVGVKernElement() => _SvgElementFactoryProvider.createSvgElement_tag("vkern");
 }