Guard dbus component and config with assert(use_dbus)

build/config/linux/dbus/BUILD.gn

Index: build/config/linux/dbus/BUILD.gn
diff --git a/build/config/linux/dbus/BUILD.gn b/build/config/linux/dbus/BUILD.gn
index a26ca92b5fcfdfd2b175d3cf5d481b75db4cadeb..55959721c11f6061aa1110ad66d389963256b54e 100644
--- a/build/config/linux/dbus/BUILD.gn
+++ b/build/config/linux/dbus/BUILD.gn
@@ -2,10 +2,13 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 
 # Note: if your target also depends on //dbus, you don't need to add this
 # config (it will get added automatically if you depend on //dbus).
-pkg_config("dbus") {
-  packages = [ "dbus-1" ]
+if (use_dbus) {

[mbjorge, 2016/05/31 20:38:39]

Changed this to an assert also

+  pkg_config("dbus") {
+    packages = [ "dbus-1" ]
+  }
 }