Rename mappedBy to map.

sdk/lib/_internal/dartdoc/lib/dartdoc.dart

Index: sdk/lib/_internal/dartdoc/lib/dartdoc.dart
diff --git a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
index 657670180fb303bf6f3ab0d7c1a9222b4bb39e8c..2520489dca15a220e690d97c1d6c377cfb9fe456 100644
--- a/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
+++ b/sdk/lib/_internal/dartdoc/lib/dartdoc.dart
@@ -357,7 +357,7 @@ class Dartdoc {
     }
 
     startFile("apidoc.json");
-    var libraries = _sortedLibraries.mappedBy(
+    var libraries = _sortedLibraries.map(
         (lib) => new LibraryElement(lib.qualifiedName, lib))
         .toList();
     write(json_serializer.serialize(libraries));
@@ -1700,7 +1700,7 @@ class Dartdoc {
     final typeArgs = type.typeArguments;
     if (typeArgs.length > 0) {
       final args =
-          Strings.join(typeArgs.mappedBy((arg) => typeName(arg)), ', ');
+          Strings.join(typeArgs.map((arg) => typeName(arg)), ', ');
       return '${type.originalDeclaration.simpleName}<$args>';
     }