Flutter clean Flutter.podspec (#72306)

packages/flutter_tools/lib/src/project.dart

diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index 064c10b..8c22cff 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -692,6 +692,11 @@
       .childDirectory('Flutter')
       .childDirectory('Flutter.framework');
 
+  /// Used only for "flutter clean" to remove old references.
+  File get flutterPodspec => _flutterLibRoot
+      .childDirectory('Flutter')
+      .childFile('Flutter.podspec');
+
   Directory get pluginRegistrantHost {
     return isModule
         ? _flutterLibRoot