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 2e93167204d9f1b94b6d1ebb4e6854205f7979a7..6953509659a4da9de3f7cee1c08e26fb8e70f62a 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -1026,6 +1026,8 @@ 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",
@@ -1057,6 +1059,7 @@ 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",
@@ -1095,6 +1098,7 @@ static_library("ash_shell_lib_with_content") {
     "//device/bluetooth",
     "//net",
     "//skia",
+    "//ui/app_list/presenter:test_support",
     "//ui/aura",
     "//ui/base",
     "//ui/base/ime",
@@ -1363,7 +1367,9 @@ 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",