Guard dbus component and config with assert(use_dbus)

device/media_transfer_protocol/BUILD.gn

Index: device/media_transfer_protocol/BUILD.gn
diff --git a/device/media_transfer_protocol/BUILD.gn b/device/media_transfer_protocol/BUILD.gn
index a36c606e93bb675e245b24bb993685e8eaa10d4e..57cb8957e9ed16d218c45d7c8022fd9e8b4ff243 100644
--- a/device/media_transfer_protocol/BUILD.gn
+++ b/device/media_transfer_protocol/BUILD.gn
@@ -2,6 +2,7 @@
 # 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("//third_party/protobuf/proto_library.gni")
 
 # GYP version: device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_file_entry_proto
@@ -34,9 +35,11 @@ static_library("media_transfer_protocol") {
     ":mtp_storage_info_proto",
     "//base",
   ]
-  deps = [
-    "//dbus",
-  ]
+  if (use_dbus) {
+    deps = [
+      "//dbus",
+    ]
+  }
 
   if (is_chromeos) {
     deps += [ "//chromeos" ]