//device/media_transfer_protocol depends on dbus

The build should fail early if //device/media_transfer_protocol is included with dbus explicitly disabled.

BUG=632297

Review-Url: https://codereview.chromium.org/2333573003
Cr-Commit-Position: refs/heads/master@{#418744}

chrome/browser/BUILD.gn

@@ -2073,7 +2073,7 @@ split_static_library("browser") {
     defines += [ "ENABLE_HOTWORDING" ]
   }
 
-  if (is_linux) {
+  if (is_linux && use_dbus) {
     deps += [ "//device/media_transfer_protocol" ]
   }
 

components/storage_monitor/BUILD.gn

@@ -56,7 +56,7 @@ static_library("storage_monitor") {
     ]
   }
 
-  if (is_linux) {
+  if (is_linux && use_dbus) {
     deps += [
       "//device/media_transfer_protocol",
       "//device/media_transfer_protocol:mtp_file_entry_proto",
@@ -111,7 +111,7 @@ static_library("test_support") {
     "//content/public/browser",
   ]
 
-  if (is_linux) {
+  if (is_linux && use_dbus) {
     deps = [
       "//device/media_transfer_protocol",
       "//device/media_transfer_protocol:mtp_file_entry_proto",
@@ -146,7 +146,7 @@ source_set("unit_tests") {
     "//testing/gtest",
   ]
 
-  if (is_linux) {
+  if (is_linux && use_dbus) {
     deps += [ "//device/media_transfer_protocol" ]
     if (!is_chromeos) {
       sources += [ "storage_monitor_linux_unittest.cc" ]

device/media_transfer_protocol/BUILD.gn

@@ -5,6 +5,8 @@
 import("//build/config/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 
+assert(use_dbus)
+
 # GYP version: device/media_transfer_protocol/media_transfer_protocol.gyp:mtp_file_entry_proto
 proto_library("mtp_file_entry_proto") {
   sources = [