[settings] Migrate back to watch

This a step in the process to rename Watch2 to Watch. A previous api
change required us to add a version of Watch that didn't return a
result/error, so it had to be renamed Watch2 so that both could
exist for a soft-transition. This change is to migrate back to the name
Watch.

Bug: 55719
Test: fx run-host-tests ermine_settings_unittests

Change-Id: I5e48f8eca20200c351325b0cb693c8a74c097d79
Reviewed-on: https://fuchsia-review.googlesource.com/c/experiences/+/414055
Reviewed-by: William Leshner <wleshner@google.com>
Testability-Review: Chip Fukuhara <cfukuhara@google.com>
Commit-Queue: Chip Fukuhara <cfukuhara@google.com>
diff --git a/session_shells/ermine/settings/lib/src/timezone.dart b/session_shells/ermine/settings/lib/src/timezone.dart
index 11b1a26..133e2cc 100644
--- a/session_shells/ermine/settings/lib/src/timezone.dart
+++ b/session_shells/ermine/settings/lib/src/timezone.dart
@@ -112,7 +112,7 @@
 
   _TimeZoneModel({this.intlSettingsService, this.onChange}) {
     // Get current timezone and watch it for changes.
-    intlSettingsService.watch2().then(_onIntlSettingsChange);
+    intlSettingsService.watch().then(_onIntlSettingsChange);
   }
 
   Future<void> _onIntlSettingsChange(IntlSettings intlSettings) async {
@@ -124,7 +124,7 @@
     }
     // Use the FIDL "hanging get" pattern to request the next update.
     if (intlSettingsService != null) {
-      await intlSettingsService.watch2().then(_onIntlSettingsChange);
+      await intlSettingsService.watch().then(_onIntlSettingsChange);
     }
   }
 
diff --git a/session_shells/ermine/settings/test/timezone_test.dart b/session_shells/ermine/settings/test/timezone_test.dart
index e47ea84..4bee210 100644
--- a/session_shells/ermine/settings/test/timezone_test.dart
+++ b/session_shells/ermine/settings/test/timezone_test.dart
@@ -25,7 +25,7 @@
   });
 
   test('Timezone', () async {
-    when(intlSettingsProxy.watch2())
+    when(intlSettingsProxy.watch())
         .thenAnswer((_) => Future<IntlSettings>.value(IntlSettings(
               timeZoneId: TimeZoneId(id: 'Foo'),
             )));
@@ -42,7 +42,7 @@
   test('Change Timezone', () async {
     var response = 'tz1';
 
-    when(intlSettingsProxy.watch2()).thenAnswer((_) {
+    when(intlSettingsProxy.watch()).thenAnswer((_) {
       return Future<IntlSettings>.value(IntlSettings(
         timeZoneId: TimeZoneId(id: response),
       ));