Fix dart2js analyzer test error.

pkg/compiler/lib/src/ssa/builder_kernel.dart

Index: pkg/compiler/lib/src/ssa/builder_kernel.dart
diff --git a/pkg/compiler/lib/src/ssa/builder_kernel.dart b/pkg/compiler/lib/src/ssa/builder_kernel.dart
index b1b9aef2e7f1e90bbbe2e3d20718027294379ddb..320628755e7ee3b70871c80241813e77cbfbf489 100644
--- a/pkg/compiler/lib/src/ssa/builder_kernel.dart
+++ b/pkg/compiler/lib/src/ssa/builder_kernel.dart
@@ -247,7 +247,7 @@ class KernelSsaBuilder extends ir.Visitor with GraphBuilder {
         // This is a little bit wacky (and n^2) until we make the localsHandler
         // take Kernel DartTypes instead of just the AST DartTypes.
         var typeVariableType = astAdapter
-            .getElement(enclosing)
+            .getClass(enclosing)
             .typeVariables
             .firstWhere(
                 (ResolutionTypeVariableType i) => i.name == typeParameter.name);