Remove docked windows entirely in M59.

ash/public/cpp/shell_window_ids.cc

Index: ash/public/cpp/shell_window_ids.cc
diff --git a/ash/public/cpp/shell_window_ids.cc b/ash/public/cpp/shell_window_ids.cc
index 5f4edcb4854e90e68650ee8ebbbae699081345a4..6ab70fdeb29ffda942fb8d740ed2c7456a006c02 100644
--- a/ash/public/cpp/shell_window_ids.cc
+++ b/ash/public/cpp/shell_window_ids.cc
@@ -17,11 +17,11 @@ const int32_t kActivatableShellWindowIds[] = {
     kShellWindowId_SystemModalContainer, kShellWindowId_AlwaysOnTopContainer,
     kShellWindowId_AppListContainer, kShellWindowId_DefaultContainer,
 
-    // Docked, panel, launcher and status are intentionally checked after other
+    // Panel, launcher and status are intentionally checked after other
     // containers even though these layers are higher. The user expects their
     // windows to be focused before these elements.
-    kShellWindowId_DockedContainer, kShellWindowId_PanelContainer,
-    kShellWindowId_ShelfContainer, kShellWindowId_StatusContainer,
+    kShellWindowId_PanelContainer, kShellWindowId_ShelfContainer,
+    kShellWindowId_StatusContainer,
 };
 
 const size_t kNumActivatableShellWindowIds =