[Fuchsia] Remove default app permissions

Previously CastComponent was granting PROTECTED_MEDIA_IDENTIFIER
permissions when permissions field is missing from the config. This is
no longer necessary because ApplicationConfigManager now sets
permissions for all apps.

Bug: 922833
Change-Id: I29205db3ca6f3a46daa42924f71e4fff11d60abc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2093395
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748189}

fuchsia/runners/cast/cast_component.cc

@@ -97,15 +97,6 @@ void CastComponent::StartComponent() {
       frame()->SetPermissionState(std::move(permission_clone), origin,
                                   fuchsia::web::PermissionState::GRANTED);
     }
-  } else {
-    // Grant PROTECTED_MEDIA_IDENTIFIER permission if permissions are not
-    // specified in the config. This is necessary for compatibility with older
-    // ApplicationConfigManager implementations that do not set permissions.
-    fuchsia::web::PermissionDescriptor eme_id_permission;
-    eme_id_permission.set_type(
-        fuchsia::web::PermissionType::PROTECTED_MEDIA_IDENTIFIER);
-    frame()->SetPermissionState(std::move(eme_id_permission), origin,
-                                fuchsia::web::PermissionState::GRANTED);
   }
 }