[Chromecast] Enable extensions for device builds

The existing condition doesn't enable device linux builds as they can
never have use_dbus=true. Now that fixes for the build have landed this
can be changed

Bug: None
Test: local builds
Change-Id: I315512a3a0dfe538545eec64135d48c272499711
Reviewed-on: https://chromium-review.googlesource.com/907372
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536893}

diff --git a/chromecast/chromecast.gni b/chromecast/chromecast.gni
index a3dc67f..e3a34661 100644
--- a/chromecast/chromecast.gni
+++ b/chromecast/chromecast.gni

@@ -102,8 +102,7 @@
 # in //build/config/locales.gni.
 cast_locales = locales
 
-# Currently extensions require use_dbus=true if it is a linux build.
-enable_chromecast_extensions = enable_extensions && (!is_linux || use_dbus)
+enable_chromecast_extensions = enable_extensions
 
 # These templates are a temporary fix fo link libc++ into shared libraries and
 # executables. These should be removed as soon as crbug.com/746091 is resolved.