Revert "Remove deprecated mappedBy."

sdk/lib/svg/dartium/svg_dartium.dart

Index: sdk/lib/svg/dartium/svg_dartium.dart
diff --git a/sdk/lib/svg/dartium/svg_dartium.dart b/sdk/lib/svg/dartium/svg_dartium.dart
index c0d430b607636adad9d97c1c651c0f5d5558fa90..98cb362a64e0a9e131aa4fc76bb2604d1337cef2 100644
--- a/sdk/lib/svg/dartium/svg_dartium.dart
+++ b/sdk/lib/svg/dartium/svg_dartium.dart
@@ -3346,6 +3346,9 @@ class LengthList extends NativeFieldWrapperClass1 implements List<Length> {
   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);
 
@@ -4047,6 +4050,9 @@ class NumberList extends NativeFieldWrapperClass1 implements List<Number> {
   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);
 
@@ -5224,6 +5230,9 @@ class PathSegList extends NativeFieldWrapperClass1 implements List<PathSeg> {
   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);
 
@@ -6206,6 +6215,9 @@ class StringList extends NativeFieldWrapperClass1 implements List<String> {
   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);
 
@@ -7458,6 +7470,9 @@ class TransformList extends NativeFieldWrapperClass1 implements List<Transform>
   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);
 
@@ -8029,6 +8044,9 @@ class _ElementInstanceList extends NativeFieldWrapperClass1 implements List<Elem
   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);