Use mojo app list interfaces for mash and classic ash.

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 87f968aa480107dc4c8ec55f4beb537cbe9b9b71..aa46412b24798e56eb9ebf3e7ece12294e61befe 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -1027,6 +1027,8 @@ static_library("ash_shell_lib") {
     "shell/bubble.cc",
     "shell/context_menu.cc",
     "shell/context_menu.h",
+    "shell/example_app_list_presenter.cc",
+    "shell/example_app_list_presenter.h",
     "shell/example_factory.h",
     "shell/lock_view.cc",
     "shell/panel_window.cc",
@@ -1058,6 +1060,7 @@ static_library("ash_shell_lib") {
     "//components/user_manager",
     "//skia",
     "//ui/app_list/presenter",
+    "//ui/app_list/presenter:test_support",
     "//ui/aura",
     "//ui/base",
     "//ui/gfx",
@@ -1096,6 +1099,7 @@ static_library("ash_shell_lib_with_content") {
     "//device/bluetooth",
     "//net",
     "//skia",
+    "//ui/app_list/presenter:test_support",
     "//ui/aura",
     "//ui/base",
     "//ui/base/ime",
@@ -1364,7 +1368,9 @@ test("ash_unittests") {
     "//testing/gtest",
     "//third_party/icu",
     "//ui/accessibility",
+    "//ui/app_list:test_support",
     "//ui/app_list/presenter",
+    "//ui/app_list/presenter:test_support",
     "//ui/aura",
     "//ui/aura:test_support",
     "//ui/base",