Guard dbus component and config with assert(use_dbus)

chrome/browser/extensions/BUILD.gn

Index: chrome/browser/extensions/BUILD.gn
diff --git a/chrome/browser/extensions/BUILD.gn b/chrome/browser/extensions/BUILD.gn
index beb0f01b554950433943ccfbe9579230a6761985..537af73c39e29353a87842d7a1c44017c8e5cbd7 100644
--- a/chrome/browser/extensions/BUILD.gn
+++ b/chrome/browser/extensions/BUILD.gn
@@ -99,7 +99,9 @@ source_set("extensions") {
                     ".",
                     "//chrome")
     sources -= [ "api/music_manager_private/device_id_linux.cc" ]
-    configs += [ "//build/config/linux/dbus" ]
+    if (use_dbus) {
+      configs += [ "//build/config/linux/dbus" ]
+    }
     deps += [
       "//components/chrome_apps",
       "//remoting/host/it2me:common",
@@ -143,10 +145,12 @@ source_set("extensions") {
   }
 
   if (is_linux) {
-    deps += [
-      "//build/linux:fontconfig",
-      "//dbus",
-    ]
+    deps += [ "//build/linux:fontconfig" ]
+
+    if (use_dbus) {
+      deps += [ "//dbus" ]
+    }
+
     if (use_x11) {
       configs += [ "//build/config/linux:x11" ]
       deps += [