Enable MirroringService by default

Enable the feature and remove some CastRemotingConnector tests that are
deprecated.

Bug: 956609
Change-Id: I4e5931ff0b2b8b1c455c53d9f1e2e865004d3095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1929398Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723024}

chrome/browser/media/cast_remoting_connector.cc

@@ -334,7 +334,7 @@ void CastRemotingConnector::StartRemoting(RemotingBridge* bridge) {
   if (remoting_allowed_.has_value()) {
     StartRemotingIfPermitted();
   } else {
-    base::OnceCallback<void(bool)> dialog_result_callback(base::BindOnce(
+    PermissionResultCallback dialog_result_callback(base::BindOnce(
         [](base::WeakPtr<CastRemotingConnector> connector, bool is_allowed) {
           DCHECK_CURRENTLY_ON(BrowserThread::UI);
           if (!connector)

components/mirroring/service/features.cc

@@ -9,7 +9,7 @@ namespace features {
 
 // Enables or disables Mirroring Service.
 const base::Feature kMirroringService{"MirroringService",
-                                      base::FEATURE_DISABLED_BY_DEFAULT};
+                                      base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace features
 }  // namespace mirroring