Remove docked windows entirely in M59.

ash/common/accelerators/accelerator_controller.cc

Index: ash/common/accelerators/accelerator_controller.cc
diff --git a/ash/common/accelerators/accelerator_controller.cc b/ash/common/accelerators/accelerator_controller.cc
index a7e5e552c5df717fff85b37f142dfcc3828d491d..fb2c322d531f305ebf741e3bdb650c65f01f44fb 100644
--- a/ash/common/accelerators/accelerator_controller.cc
+++ b/ash/common/accelerators/accelerator_controller.cc
@@ -297,14 +297,14 @@ bool CanHandleWindowSnapOrDock() {
 }
 
 void HandleWindowSnapOrDock(AcceleratorAction action) {
-  if (action == WINDOW_CYCLE_SNAP_DOCK_LEFT)
+  if (action == WINDOW_CYCLE_SNAP_LEFT)
     base::RecordAction(UserMetricsAction("Accel_Window_Snap_Left"));
   else
     base::RecordAction(UserMetricsAction("Accel_Window_Snap_Right"));
 
-  const wm::WMEvent event(action == WINDOW_CYCLE_SNAP_DOCK_LEFT
-                              ? wm::WM_EVENT_CYCLE_SNAP_DOCK_LEFT
-                              : wm::WM_EVENT_CYCLE_SNAP_DOCK_RIGHT);
+  const wm::WMEvent event(action == WINDOW_CYCLE_SNAP_LEFT
+                              ? wm::WM_EVENT_CYCLE_SNAP_LEFT
+                              : wm::WM_EVENT_CYCLE_SNAP_RIGHT);
   WmWindow* active_window = WmShell::Get()->GetActiveWindow();
   DCHECK(active_window);
   active_window->GetWindowState()->OnWMEvent(&event);
@@ -316,9 +316,7 @@ void HandleWindowMinimize() {
 }
 
 bool CanHandlePositionCenter() {
-  // Docked windows do not support centering.
-  WmWindow* active_window = WmShell::Get()->GetActiveWindow();
-  return (active_window && !active_window->GetWindowState()->IsDocked());
+  return !!WmShell::Get()->GetActiveWindow();
 }
 
 void HandlePositionCenter() {
@@ -799,8 +797,8 @@ bool AcceleratorController::CanPerformAction(
       return CanHandleToggleAppList(accelerator, previous_accelerator);
     case TOGGLE_CAPS_LOCK:
       return CanHandleToggleCapsLock(accelerator, previous_accelerator);
-    case WINDOW_CYCLE_SNAP_DOCK_LEFT:
-    case WINDOW_CYCLE_SNAP_DOCK_RIGHT:
+    case WINDOW_CYCLE_SNAP_LEFT:
+    case WINDOW_CYCLE_SNAP_RIGHT:
       return CanHandleWindowSnapOrDock();
     case WINDOW_POSITION_CENTER:
       return CanHandlePositionCenter();
@@ -1063,8 +1061,8 @@ void AcceleratorController::PerformAction(AcceleratorAction action,
     case VOLUME_UP:
       HandleVolumeUp(volume_controller_.get(), accelerator);
       break;
-    case WINDOW_CYCLE_SNAP_DOCK_LEFT:
-    case WINDOW_CYCLE_SNAP_DOCK_RIGHT:
+    case WINDOW_CYCLE_SNAP_LEFT:
+    case WINDOW_CYCLE_SNAP_RIGHT:
       HandleWindowSnapOrDock(action);
       break;
     case WINDOW_MINIMIZE: