Revert "Remove deprecated mappedBy."

sdk/lib/svg/dart2js/svg_dart2js.dart

Index: sdk/lib/svg/dart2js/svg_dart2js.dart
diff --git a/sdk/lib/svg/dart2js/svg_dart2js.dart b/sdk/lib/svg/dart2js/svg_dart2js.dart
index 7543c2a903227ee22ebb966eaef21fb1e617d5fd..df439d6ce977ecef23043166d18f7303e15fd69e 100644
--- a/sdk/lib/svg/dart2js/svg_dart2js.dart
+++ b/sdk/lib/svg/dart2js/svg_dart2js.dart
@@ -3082,6 +3082,9 @@ class LengthList implements JavaScriptIndexingBehavior, List<Length> native "*SV
   Iterable map(f(Length element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(Length element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<Length> where(bool f(Length element)) =>
       IterableMixinWorkaround.where(this, f);
 
@@ -3706,6 +3709,9 @@ class NumberList implements JavaScriptIndexingBehavior, List<Number> native "*SV
   Iterable map(f(Number element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(Number element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<Number> where(bool f(Number element)) =>
       IterableMixinWorkaround.where(this, f);
 
@@ -4606,6 +4612,9 @@ class PathSegList implements JavaScriptIndexingBehavior, List<PathSeg> native "*
   Iterable map(f(PathSeg element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(PathSeg element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<PathSeg> where(bool f(PathSeg element)) =>
       IterableMixinWorkaround.where(this, f);
 
@@ -5490,6 +5499,9 @@ class StringList implements JavaScriptIndexingBehavior, List<String> native "*SV
   Iterable map(f(String element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(String element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<String> where(bool f(String element)) =>
       IterableMixinWorkaround.where(this, f);
 
@@ -6653,6 +6665,9 @@ class TransformList implements List<Transform>, JavaScriptIndexingBehavior nativ
   Iterable map(f(Transform element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(Transform element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<Transform> where(bool f(Transform element)) =>
       IterableMixinWorkaround.where(this, f);
 
@@ -7170,6 +7185,9 @@ class _ElementInstanceList implements JavaScriptIndexingBehavior, List<ElementIn
   Iterable map(f(ElementInstance element)) =>
       IterableMixinWorkaround.mapList(this, f);
 
+  List mappedBy(f(ElementInstance element)) =>
+      IterableMixinWorkaround.mappedByList(this, f);
+
   Iterable<ElementInstance> where(bool f(ElementInstance element)) =>
       IterableMixinWorkaround.where(this, f);