mustash: Break dependency of //ash/public/interfaces on //ash

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 4b2bef37ba70fba34c7dbc09854e4658222efeb2..3a4dfc877b4b763fadd27303f708a89dec184c2c 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -163,7 +163,6 @@ component("ash") {
     "common/shelf/shelf_model_observer.h",
     "common/shelf/shelf_tooltip_manager.cc",
     "common/shelf/shelf_tooltip_manager.h",
-    "common/shelf/shelf_types.h",
     "common/shelf/shelf_view.cc",
     "common/shelf/shelf_view.h",
     "common/shelf/shelf_widget.cc",
@@ -823,6 +822,7 @@ component("ash") {
   ]
   deps = [
     "//ash/autoclick/common:autoclick",
+    "//ash/public/cpp",
     "//ash/touch_hud",
     "//base",
     "//base:i18n",
@@ -1254,6 +1254,7 @@ static_library("ash_shell_lib") {
     ":ash_with_content",
     ":test_support_without_content",
     "//ash/common/strings",
+    "//ash/public/cpp",
     "//ash/resources",
     "//base",
     "//base:i18n",
@@ -1339,6 +1340,7 @@ test("ash_content_unittests") {
     ":ash_with_aura_test_support",
     ":ash_with_content",
     ":test_support_with_content",
+    "//ash/public/cpp",
     "//base",
     "//base/test:test_support",
     "//components/signin/core/account_id",
@@ -1542,6 +1544,7 @@ test("ash_unittests") {
     ":test_support_without_content",
     "//ash/autoclick/common:autoclick",
     "//ash/common/strings",
+    "//ash/public/cpp",
     "//ash/resources",
     "//ash/touch_hud",
     "//base",