Revert of Provide capability classes from Mus

ui/views/mus/BUILD.gn

Index: ui/views/mus/BUILD.gn
diff --git a/ui/views/mus/BUILD.gn b/ui/views/mus/BUILD.gn
index 7fc833cf0cf01768e4fd85106f54476c6b8905c4..bb087d4bdf5ace401b8ae25aaa75d5631f3c7bfc 100644
--- a/ui/views/mus/BUILD.gn
+++ b/ui/views/mus/BUILD.gn
@@ -5,7 +5,6 @@
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//mojo/public/mojo_application.gni")
-import("//mojo/public/mojo_application_manifest.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
@@ -196,7 +195,6 @@
   ]
 
   data_deps = [
-    ":unittests_manifest",
     "//mash/wm",
   ]
 
@@ -232,12 +230,6 @@
   }
 }
 
-mojo_application_manifest("unittests_manifest") {
-  type = "exe"
-  application_name = "views_mus_unittests"
-  source = "unittests_manifest.json"
-}
-
 group("for_component") {
   public_deps = [
     ":mus",