Elements. Remove V1 PartElement.

Change-Id: Id78a06bcebb84c343e79111d1bad0ebe92680bca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/423442
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/api.txt

@@ -3152,9 +3152,6 @@ package:analyzer/dart/element/element.dart:
   NamespaceCombinator (class extends Object, sealed (immediate subtypes: HideElementCombinator, ShowElementCombinator)):
     end (getter: int)
     offset (getter: int)
-  PartElement (class extends Object implements _ExistingElement, deprecated):
-    new (constructor: PartElement Function())
-    uri (getter: DirectiveUri)
   ShowElementCombinator (class extends Object implements NamespaceCombinator):
     new (constructor: ShowElementCombinator Function())
     shownNames (getter: List<String>)

pkg/analyzer/lib/dart/element/element.dart

@@ -823,15 +823,6 @@ sealed class NamespaceCombinator {
   int get offset;
 }
 
-/// A 'part' directive within a library.
-///
-/// Clients may not extend, implement or mix-in this class.
-@Deprecated('Use PartInclude instead')
-abstract class PartElement implements _ExistingElement {
-  /// The interpretation of the URI specified in the directive.
-  DirectiveUri get uri;
-}
-
 /// A combinator that cause some of the names in a namespace to be visible (and
 /// the rest hidden) when being imported.
 ///

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

@@ -8838,11 +8838,7 @@ mixin ParameterElementMixin implements VariableElementOrMember {
   }
 }
 
-class PartElementImpl extends _ExistingElementImpl
-    implements
-        // ignore:deprecated_member_use_from_same_package,analyzer_use_new_elements
-        PartElement,
-        PartInclude {
+class PartElementImpl extends _ExistingElementImpl implements PartInclude {
   @override
   final DirectiveUriImpl uri;