chromeos: updates content_browser manifest to include priviledged interface

The browser is responsible for injecting events when using remote desktop.
This means, it needs the priviledged interface from the window-service.

BUG=944210
TEST=none

Change-Id: I8fb9b43a8a446a54bd9c9112c4fbe5985770ebe1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532246
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643094}
1 file changed