Remove _DeferredClassElement because ClassElementImpl is now lazy.

pkg/analyzer/lib/src/dart/element/handle.dart

Index: pkg/analyzer/lib/src/dart/element/handle.dart
diff --git a/pkg/analyzer/lib/src/dart/element/handle.dart b/pkg/analyzer/lib/src/dart/element/handle.dart
index 0e714999944dbdf21edafb64bd87a4b3790633e9..776a26e5eaa78a6f77dd3879056a3cf913c533be 100644
--- a/pkg/analyzer/lib/src/dart/element/handle.dart
+++ b/pkg/analyzer/lib/src/dart/element/handle.dart
@@ -98,67 +98,29 @@ class ClassElementHandle extends ElementHandle implements ClassElement {
   List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
 
   @override
-  ConstructorElement get unnamedConstructor {
-    ensureConstructorsReady();
-    return actualElement.unnamedConstructor;
-  }
+  ConstructorElement get unnamedConstructor => actualElement.unnamedConstructor;
 
   @override
   NamedCompilationUnitMember computeNode() => super.computeNode();
 
-  /**
-   * Ensure that [ClassElement.accessors] and [ClassElement.fields] are ready
-   * in [actualElement].
-   */
-  void ensureAccessorsReady() {}
-
-  /**
-   * The method is called by [ClassElementImpl.getImpl] before returning
-   * the [actualElement] as [ClassElementImpl]. At this moment we must ensure
-   * that [ClassElementImpl] is fully complete, we cannot continue filling it
-   * lazily.
-   */
-  void ensureActualElementComplete() {}
-
-  /**
-   * Ensure that [ClassElement.constructors] are ready in [actualElement].
-   */
-  void ensureConstructorsReady() {}
-
-  /**
-   * Ensure that [ClassElement.methods] are ready in [actualElement].
-   */
-  void ensureMethodsReady() {}
-
   @override
-  FieldElement getField(String fieldName) {
-    ensureAccessorsReady();
-    return actualElement.getField(fieldName);
-  }
+  FieldElement getField(String fieldName) => actualElement.getField(fieldName);
 
   @override
-  PropertyAccessorElement getGetter(String getterName) {
-    ensureAccessorsReady();
-    return actualElement.getGetter(getterName);
-  }
+  PropertyAccessorElement getGetter(String getterName) =>
+      actualElement.getGetter(getterName);
 
   @override
-  MethodElement getMethod(String methodName) {
-    ensureMethodsReady();
-    return actualElement.getMethod(methodName);
-  }
+  MethodElement getMethod(String methodName) =>
+      actualElement.getMethod(methodName);
 
   @override
-  ConstructorElement getNamedConstructor(String name) {
-    ensureConstructorsReady();
-    return actualElement.getNamedConstructor(name);
-  }
+  ConstructorElement getNamedConstructor(String name) =>
+      actualElement.getNamedConstructor(name);
 
   @override
-  PropertyAccessorElement getSetter(String setterName) {
-    ensureAccessorsReady();
-    return actualElement.getSetter(setterName);
-  }
+  PropertyAccessorElement getSetter(String setterName) =>
+      actualElement.getSetter(setterName);
 
   @override
   bool isSuperConstructorAccessible(ConstructorElement constructor) =>
@@ -166,10 +128,8 @@ class ClassElementHandle extends ElementHandle implements ClassElement {
 
   @override
   MethodElement lookUpConcreteMethod(
-      String methodName, LibraryElement library) {
-    ensureMethodsReady();
-    return actualElement.lookUpConcreteMethod(methodName, library);
-  }
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpConcreteMethod(methodName, library);
 
   @override
   PropertyAccessorElement lookUpGetter(
@@ -178,44 +138,33 @@ class ClassElementHandle extends ElementHandle implements ClassElement {
 
   @override
   PropertyAccessorElement lookUpInheritedConcreteGetter(
-      String methodName, LibraryElement library) {
-    ensureAccessorsReady();
-    return actualElement.lookUpInheritedConcreteGetter(methodName, library);
-  }
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteGetter(methodName, library);
 
   @override
   MethodElement lookUpInheritedConcreteMethod(
-      String methodName, LibraryElement library) {
-    ensureMethodsReady();
-    return actualElement.lookUpInheritedConcreteMethod(methodName, library);
-  }
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteMethod(methodName, library);
 
   @override
   PropertyAccessorElement lookUpInheritedConcreteSetter(
-      String methodName, LibraryElement library) {
-    ensureAccessorsReady();
-    return actualElement.lookUpInheritedConcreteSetter(methodName, library);
-  }
+          String methodName, LibraryElement library) =>
+      actualElement.lookUpInheritedConcreteSetter(methodName, library);
 
   @override
   MethodElement lookUpInheritedMethod(
       String methodName, LibraryElement library) {
-    ensureMethodsReady();
     return actualElement.lookUpInheritedMethod(methodName, library);
   }
 
   @override
-  MethodElement lookUpMethod(String methodName, LibraryElement library) {
-    ensureMethodsReady();
-    return actualElement.lookUpMethod(methodName, library);
-  }
+  MethodElement lookUpMethod(String methodName, LibraryElement library) =>
+      actualElement.lookUpMethod(methodName, library);
 
   @override
   PropertyAccessorElement lookUpSetter(
-      String setterName, LibraryElement library) {
-    ensureAccessorsReady();
-    return actualElement.lookUpSetter(setterName, library);
-  }
+          String setterName, LibraryElement library) =>
+      actualElement.lookUpSetter(setterName, library);
 }
 
 /**