Rename Constant to ConstantValue and ConstExp to ConstantExpression.

sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart b/sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart
index ade211ddbe654163898b5bd17ebf8f0c732845bc..9a5c8e987940a9ec62bb27bc9291ab808012f7ee 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/custom_elements_analysis.dart
@@ -166,7 +166,7 @@ class CustomElementsAnalysisJoin {
             .forEach(compiler.globalDependencies.registerDependency);
         // Force the generaton of the type constant that is the key to an entry
         // in the generated table.
-        Constant constant = makeTypeConstant(classElement);
+        ConstantValue constant = makeTypeConstant(classElement);
         backend.registerCompileTimeConstant(
             constant, compiler.globalDependencies);
         backend.constants.addCompileTimeConstantForEmission(constant);
@@ -176,10 +176,10 @@ class CustomElementsAnalysisJoin {
     instantiatedClasses.removeAll(newActiveClasses);
   }
 
-  TypeConstant makeTypeConstant(ClassElement element) {
+  TypeConstantValue makeTypeConstant(ClassElement element) {
     DartType elementType = element.rawType;
     DartType constantType = backend.typeImplementation.rawType;
-    return new TypeConstant(elementType, constantType);
+    return new TypeConstantValue(elementType, constantType);
   }
 
   List<Element> computeEscapingConstructors(ClassElement classElement) {