Fix the 'Unused import' hint when using package summaries.

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

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 530539595434b8fb77939f46c74bcff8dd6329d4..12e07f2eb0f227c513edb06a88974afda3cb2a42 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -3148,9 +3148,6 @@ class LibraryElementImpl extends ElementImpl implements LibraryElement {
   }
 
   @override
-  int get hashCode => _definingCompilationUnit.hashCode;
-
-  @override
   bool get hasLoadLibraryFunction {
     if (_definingCompilationUnit.hasLoadLibraryFunction) {
       return true;
@@ -3365,11 +3362,6 @@ class LibraryElementImpl extends ElementImpl implements LibraryElement {
   }
 
   @override
-  bool operator ==(Object object) =>
-      object is LibraryElementImpl &&
-      _definingCompilationUnit == object.definingCompilationUnit;
-
-  @override
   accept(ElementVisitor visitor) => visitor.visitLibraryElement(this);
 
   /**