Guard dbus component and config with assert(use_dbus)

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 5df14a4b99031d956c4dd09a748975acb727e6f3..77d28ea0c061a0eee6fca8729cedbca82c5d6486 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -867,11 +867,12 @@ source_set("browser") {
 
   if (is_linux) {
     if (use_aura) {
-      configs += [ "//build/config/linux/dbus" ]
-      deps += [
-        "//build/linux:fontconfig",
-        "//dbus",
-      ]
+      deps += [ "//build/linux:fontconfig" ]
+
+      if (use_dbus) {
+        configs += [ "//build/config/linux/dbus" ]

[slan, 2016/05/25 22:35:18]

nit: rm - we get this for free via //dbus.

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

Done

+        deps += [ "//dbus" ]
+      }
     }
     if (use_x11) {
       configs += [ "//build/config/linux:x11" ]