[Media Router] Conditionally enable mDNS on Windows.

chrome/browser/media/android/router/media_router_android.cc

Index: chrome/browser/media/android/router/media_router_android.cc
diff --git a/chrome/browser/media/android/router/media_router_android.cc b/chrome/browser/media/android/router/media_router_android.cc
index 8b1c30f30b85836a81d50d3a0a87b8616acb1117..ff2e7dd145745c0837fa754ae2192d3852d1c28a 100644
--- a/chrome/browser/media/android/router/media_router_android.cc
+++ b/chrome/browser/media/android/router/media_router_android.cc
@@ -244,6 +244,15 @@ void MediaRouterAndroid::ClearIssue(const Issue::Id& issue_id) {
   NOTIMPLEMENTED();
 }
 
+bool MediaRouterAndroid::is_mdns_discovery_enabled() const {
+  NOTIMPLEMENTED();

[mark a. foltz, 2016/03/24 00:04:41]

I don't think this is necessary, you have an implementation below?
Unless it's a bug to call this at all in Android.

[btolsch, 2016/03/24 01:44:03]

The original design called for this to only be in MediaRouterMojoImpl to avoid
having any code in Android, but testing made that difficult for now. So yes I
think this shouldn't be called on Android.

I'll let Derek have the final answer to whether this is appropriate.

+  return true;
+}
+
+void MediaRouterAndroid::EnableMdnsDiscovery() {
+  NOTIMPLEMENTED();
+}
+
 void MediaRouterAndroid::DetachRoute(const MediaRoute::Id& route_id) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> jroute_id =