[Chromecast] Add missing required capabilities

Add "app", "multizone", which are needed when talking to chromecast
service.

Bug: internal b/161738703
Test: Run cast_shell without crash
Change-Id: I47082f4b48ed167d29db1c8ce5f63027fd8eeea2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324761Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792533}

content/browser/service_manager/service_manager_context.cc

@@ -81,7 +81,8 @@ const service_manager::Manifest& GetContentBrowserManifest() {
                            .CanConnectToInstancesWithAnyId(true)
                            .CanRegisterOtherServiceInstances(true)
                            .Build())
-          .RequireCapability("chromecast", "*")
+          .RequireCapability("*", "app")
+          .RequireCapability("*", "multizone")
           .Build()};
   return *manifest;
 }