Remove UriReferencedElement with its uri/uriOffset/uriEnd properties.

pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart

Index: pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart b/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
index 2ee39fb3e2fb79b44ece1ab6f8356341dc2f061c..462d7872ff61959dae9b039e5d70b900714b27eb 100644
--- a/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
+++ b/pkg/analysis_server/test/services/completion/dart/completion_manager_test.dart
@@ -67,10 +67,16 @@ part '$testFile';
     expect(imports, hasLength(directives.length + 1));
 
     ImportElement importNamed(String expectedUri) {
-      return imports.firstWhere((elem) => elem.uri == expectedUri, orElse: () {
-        var importedNames = imports.map((elem) => elem.uri);
-        fail('Failed to find $expectedUri in $importedNames');
-      });
+      List<String> uriList = <String>[];
+      for (ImportElement importElement in imports) {
+        String uri = importElement.importedLibrary.source.uri.toString();
+        uriList.add(uri);
+        if (uri.endsWith(expectedUri)) {
+          return importElement;
+        }
+      }
+      fail('Failed to find $expectedUri in $uriList');
+      return null;
     }
 
     void assertImportedLib(String expectedUri) {
@@ -79,7 +85,7 @@ part '$testFile';
     }
 
     // Assert that the new imports each have an export namespace
-    assertImportedLib(null /* dart:core */);
-    assertImportedLib('/libA.dart');
+    assertImportedLib('dart:core');
+    assertImportedLib('libA.dart');
   }
 }