athena: A simpler implementation of WindowListProvider.

athena/athena.gyp

Index: athena/athena.gyp
diff --git a/athena/athena.gyp b/athena/athena.gyp
index a8ae58c84a68600b9065d941eb97bcb7af7e45ca..ea40e207e72ac11fd911eb2917f569df3208227e 100644
--- a/athena/athena.gyp
+++ b/athena/athena.gyp
@@ -72,8 +72,6 @@
         'system/system_ui_impl.cc',
         'wm/bezel_controller.cc',
         'wm/bezel_controller.h',
-        'wm/mru_window_tracker.cc',
-        'wm/mru_window_tracker.h',
         'wm/overview_toolbar.cc',
         'wm/overview_toolbar.h',
         'wm/public/window_list_provider.h',
@@ -83,6 +81,8 @@
         'wm/split_view_controller.h',
         'wm/title_drag_controller.cc',
         'wm/title_drag_controller.h',
+        'wm/window_list_provider_impl.cc',
+        'wm/window_list_provider_impl.h',
         'wm/window_manager_impl.cc',
         'wm/window_overview_mode.cc',
         'wm/window_overview_mode.h',
@@ -176,6 +176,7 @@
         'home/home_card_unittest.cc',
         'input/accelerator_manager_unittest.cc',
         'screen/screen_manager_unittest.cc',
+        'wm/window_list_provider_impl_unittest.cc',
         'wm/window_manager_unittest.cc',
       ],
     }