chromeos: Cleanup comments and DEPS in //ash

ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc

Index: ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc
diff --git a/ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc b/ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc
index e5ce36912c8c786705a7960e4dbb914891dc131b..3601ff7c30662095c86f62c7aeba7a6723d45a84 100644
--- a/ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc
+++ b/ash/wm/workspace/workspace_layout_manager_keyboard_unittest.cc
@@ -46,8 +46,6 @@ WorkspaceLayoutManager* GetWorkspaceLayoutManager(WmWindow* container) {
 
 }  // namespace
 
-// TODO: this is a duplicate of that in ash/common, and should move once
-// keyboard is refactored to work in mash.
 class WorkspaceLayoutManagerKeyboardTest : public AshTest {
  public:
   WorkspaceLayoutManagerKeyboardTest() : layout_manager_(nullptr) {}