mustash: Enable connections to mus from the Chrome renderer [take 2]

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 954c3ee78bc9e699f972054f1def6944d735bffe..0f16c8e8e13c926fe4d72c7ec5d181787a1f4fdf 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -423,6 +423,8 @@ source_set("browser") {
   if (use_aura) {
     deps += [
       "//components/bitmap_uploader",
+      "//components/mus/public/cpp",
+      "//components/mus/public/interfaces",
       "//ui/aura",
       "//ui/aura_extra",
       "//ui/strings",
@@ -432,6 +434,8 @@ source_set("browser") {
     sources += [
       "compositor/software_output_device_mus.cc",
       "compositor/software_output_device_mus.h",
+      "mus_util.cc",
+      "mus_util.h",
       "renderer_host/render_widget_host_view_mus.cc",
       "renderer_host/render_widget_host_view_mus.h",
       "web_contents/web_contents_view_mus.cc",