Revert "cps-ir: Support foreign code."

pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart

Index: pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart b/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
index b5482ce8f005103df3fa437f79ba5d47594fd8fb..98893f8630bc428eeee63f59cefd720693a1d612 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.dart
@@ -78,24 +78,4 @@ class JsTreeBuilder extends Builder {
     return new CreateInvocationMirror(node.selector,
         node.arguments.map(getVariableUse).toList(growable: false));
   }
-
-  Statement visitForeignCode(cps_ir.ForeignCode node) {
-    if (node.codeTemplate.isExpression) {
-      Expression foreignCode = new ForeignExpression(
-          node.codeTemplate,
-          node.type,
-          node.arguments.map(getVariableUse).toList(growable: false),
-          node.nativeBehavior,
-          node.dependency);
-      return continueWithExpression(node.continuation, foreignCode);
-    } else {
-      assert(node.continuation == null);
-      return new ForeignStatement(
-          node.codeTemplate,
-          node.type,
-          node.arguments.map(getVariableUse).toList(growable: false),
-          node.nativeBehavior,
-          node.dependency);
-    }
-  }
 }