Fix issues that caused revert of r30955:

dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart

Index: dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart b/dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart
index 1ebb578d2635a53beb60969f7b8d5d76255c2bab..f55026a806851c867fee259d14676437a3f09cb9 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/js_emitter/container_builder.dart
@@ -326,9 +326,11 @@ class ContainerBuilder extends CodeEmitterHelper {
     bool needsStubs = !parameters.optionalParameters.isEmpty;
     bool canTearOff = false;
     bool isClosure = false;
+    bool canBeApplied = compiler.enabledFunctionApply;
     String tearOffName;
     if (!member.isFunction() || member.isConstructor() || member.isAccessor()) {
       canTearOff = false;
+      canBeApplied = false;
     } else if (member.isInstanceMember()) {
       if (member.getEnclosingClass().isClosure()) {
         canTearOff = false;
@@ -346,7 +348,7 @@ class ContainerBuilder extends CodeEmitterHelper {
 
     bool canBeReflected = backend.isAccessibleByReflection(member);
     bool needStructuredInfo =
-        canTearOff || canBeReflected || compiler.enabledFunctionApply;
+        canTearOff || canBeReflected || canBeApplied;
     if (!needStructuredInfo) {
       builder.addProperty(name, code);
       if (needsStubs) {
@@ -449,9 +451,14 @@ class ContainerBuilder extends CodeEmitterHelper {
     }
 
     jsAst.Expression memberTypeExpression;
-    if ((canTearOff || canBeReflected) &&
-        !member.isGenerativeConstructorBody()) {
-      DartType memberType = member.computeType(compiler);
+    if (canTearOff || canBeReflected) {
+      DartType memberType;
+      if (member.isGenerativeConstructorBody()) {
+        var body = member;
+        memberType = body.constructor.computeType(compiler);
+      } else {
+        memberType = member.computeType(compiler);
+      }
       if (memberType.containsTypeVariables) {
         jsAst.Expression thisAccess = js(r'this.$receiver');
         memberTypeExpression =
@@ -473,7 +480,7 @@ class ContainerBuilder extends CodeEmitterHelper {
         ..add(memberTypeExpression)
         ..addAll(task.metadataEmitter.reifyDefaultArguments(member));
 
-    if (canBeReflected || compiler.enabledFunctionApply) {
+    if (canBeReflected || canBeApplied) {
       parameters.orderedForEachParameter((Element parameter) {
         expressions.add(task.metadataEmitter.reifyName(parameter.name));
       });
@@ -492,7 +499,7 @@ class ContainerBuilder extends CodeEmitterHelper {
       expressions
           ..add(reflectionName)
           ..addAll(task.metadataEmitter.computeMetadata(member));
-    } else if (isClosure && compiler.enabledFunctionApply) {
+    } else if (isClosure && canBeApplied) {
       expressions.add(js.string(member.name));
     }