Add missing entitlement to macOS example

packages/path_provider/path_provider_macos/example/integration_test/path_provider_test.dart

@@ -39,21 +39,15 @@ void main() {
   testWidgets('getDownloadsDirectory', (WidgetTester tester) async {
     final PathProviderPlatform provider = PathProviderPlatform.instance;
     final String result = await provider.getDownloadsPath();
-    // Create if necessary, since the native implementation doesn't guarantee
-    // that the folder exists.
-    _verifySampleFile(result, 'downloads', createDirectory: true);
+    _verifySampleFile(result, 'downloads');
   });
 }
 
 /// Verify a file called [name] in [directoryPath] by recreating it with test
 /// contents when necessary.
 ///
 /// If [createDirectory] is true, the directory will be created if missing.
-void _verifySampleFile(
-  String directoryPath,
-  String name, {
-  bool createDirectory = false,
-}) {
+void _verifySampleFile(String directoryPath, String name) {
   final Directory directory = Directory(directoryPath);
   final File file = File('${directory.path}${Platform.pathSeparator}$name');
 
@@ -62,10 +56,6 @@ void _verifySampleFile(
     expect(file.existsSync(), isFalse);
   }
 
-  if (createDirectory) {
-    directory.createSync(recursive: true);
-  }
-
   file.writeAsStringSync('Hello world!');
   expect(file.readAsStringSync(), 'Hello world!');
   expect(directory.listSync(), isNotEmpty);

packages/path_provider/path_provider_macos/example/macos/Runner/DebugProfile.entitlements

@@ -8,5 +8,7 @@
 	<true/>
 	<key>com.apple.security.network.server</key>
 	<true/>
+	<key>com.apple.security.files.downloads.read-write</key>
+	<true/>
 </dict>
 </plist>

packages/path_provider/path_provider_macos/example/macos/Runner/Release.entitlements

@@ -4,5 +4,7 @@
 <dict>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
+	<key>com.apple.security.files.downloads.read-write</key>
+	<true/>
 </dict>
 </plist>