[cleanup] fix analyzer warnings

These code paths were causing the analyzer to fail with an
unused_element lint error which was blocking the flutter roller.

Change-Id: Ib94ff67e0a2ec54acddd80b4ed401680c7fcc419
Reviewed-on: https://fuchsia-review.googlesource.com/c/experiences/+/411955
Reviewed-by: Sanjay Chouksey <sanjayc@google.com>
Testability-Review: Sanjay Chouksey <sanjayc@google.com>
Commit-Queue: Chase Latta <chaselatta@google.com>
diff --git a/session_shells/ermine/settings/lib/src/datetime.dart b/session_shells/ermine/settings/lib/src/datetime.dart
index 52e1988..3d96ed1 100644
--- a/session_shells/ermine/settings/lib/src/datetime.dart
+++ b/session_shells/ermine/settings/lib/src/datetime.dart
@@ -37,7 +37,7 @@
     _timer?.cancel();
   }
 
-  static Spec _specForDateTime([int action = 0]) {
+  static Spec _specForDateTime() {
     String dateTime = DateFormat.E().add_yMd().add_jm().format(DateTime.now());
     return Spec(title: _title, groups: [
       Group(title: _title, values: [Value.withText(TextValue(text: dateTime))]),
diff --git a/settings/lib/widgets/lib/src/model/model.dart b/settings/lib/widgets/lib/src/model/model.dart
index 5c5ec4e..904ea5d 100644
--- a/settings/lib/widgets/lib/src/model/model.dart
+++ b/settings/lib/widgets/lib/src/model/model.dart
@@ -153,6 +153,7 @@
         super(key: key, child: child);
 
   /// Used to return the runtime type.
+  //ignore: unused_element
   const _InheritedModel.forRuntimeType()
       : model = null,
         version = 0;