Start pulling apart ClassElementImpl and EnumElementImpl.

pkg/analyzer/test/src/summary/index_unit_test.dart

Index: pkg/analyzer/test/src/summary/index_unit_test.dart
diff --git a/pkg/analyzer/test/src/summary/index_unit_test.dart b/pkg/analyzer/test/src/summary/index_unit_test.dart
index 9a269b0b5b2d4097cf699fb6d08bce267f822009..1bf2cf5a611efe6bf8e2fed63eafbcd553b92282 100644
--- a/pkg/analyzer/test/src/summary/index_unit_test.dart
+++ b/pkg/analyzer/test/src/summary/index_unit_test.dart
@@ -699,7 +699,7 @@ main(A a) {
   new A(field: 4);
 }
 ''');
-    FieldElement field = findElement('field');
+    FieldElement field = findElement('field', ElementKind.FIELD);
     PropertyAccessorElement getter = field.getter;
     PropertyAccessorElement setter = field.setter;
     // A()
@@ -729,7 +729,7 @@ class A {
 ''');
     // aaa
     {
-      FieldElement field = findElement('aaa');
+      FieldElement field = findElement('aaa', ElementKind.FIELD);
       PropertyAccessorElement getter = field.getter;
       PropertyAccessorElement setter = field.setter;
       assertThat(field)..isWrittenAt('aaa, ', true);
@@ -738,7 +738,7 @@ class A {
     }
     // bbb
     {
-      FieldElement field = findElement('bbb');
+      FieldElement field = findElement('bbb', ElementKind.FIELD);
       PropertyAccessorElement getter = field.getter;
       PropertyAccessorElement setter = field.setter;
       assertThat(field)..isWrittenAt('bbb) {}', true);
@@ -964,7 +964,7 @@ class A {
   A.bar() : field = 5;
 }
 ''');
-    FieldElement element = findElement('field');
+    FieldElement element = findElement('field', ElementKind.FIELD);
     assertThat(element)
       ..isWrittenAt('field})', true)
       ..isWrittenAt('field = 5', true);