ash/wm: Remove dead code.

ui/wm/BUILD.gn

Index: ui/wm/BUILD.gn
diff --git a/ui/wm/BUILD.gn b/ui/wm/BUILD.gn
index 858183e7bc13c6834dcbfd96acf9557fdafa8645..22fb3c1294a2a040ab6b93e3b345a1537c988330 100644
--- a/ui/wm/BUILD.gn
+++ b/ui/wm/BUILD.gn
@@ -35,13 +35,6 @@ component("wm") {
     "core/masked_window_targeter.h",
     "core/native_cursor_manager.h",
     "core/native_cursor_manager_delegate.h",
-    "core/nested_accelerator_controller.cc",
-    "core/nested_accelerator_controller.h",
-    "core/nested_accelerator_delegate.h",
-    "core/nested_accelerator_dispatcher.cc",
-    "core/nested_accelerator_dispatcher.h",
-    "core/nested_accelerator_dispatcher_linux.cc",
-    "core/nested_accelerator_dispatcher_win.cc",
     "core/shadow.cc",
     "core/shadow.h",
     "core/shadow_controller.cc",
@@ -93,16 +86,6 @@ component("wm") {
   if (use_x11) {
     configs += [ "//build/config/linux:x11" ]
   }
-
-  if (is_android) {
-    sources -= [
-      "core/nested_accelerator_controller.cc",
-      "core/nested_accelerator_controller.h",
-      "core/nested_accelerator_delegate.h",
-      "core/nested_accelerator_dispatcher.cc",
-      "core/nested_accelerator_dispatcher.h",
-    ]
-  }
 }
 
 static_library("test_support") {
@@ -140,7 +123,6 @@ test("wm_unittests") {
     "core/cursor_manager_unittest.cc",
     "core/focus_controller_unittest.cc",
     "core/image_grid_unittest.cc",
-    "core/nested_accelerator_controller_unittest.cc",
     "core/shadow_controller_unittest.cc",
     "core/shadow_unittest.cc",
     "core/transient_window_manager_unittest.cc",