Remove docked windows entirely in M59.

ash/common/wm/wm_event.h

Index: ash/common/wm/wm_event.h
diff --git a/ash/common/wm/wm_event.h b/ash/common/wm/wm_event.h
index e26ba78d46a83d1b66ef46185323a2a90b672cfa..4e0d49c22643ef7a68763c9e90b97894285db864 100644
--- a/ash/common/wm/wm_event.h
+++ b/ash/common/wm/wm_event.h
@@ -27,7 +27,6 @@ enum WMEventType {
   WM_EVENT_FULLSCREEN,
   WM_EVENT_SNAP_LEFT,
   WM_EVENT_SNAP_RIGHT,
-  WM_EVENT_DOCK,
 
   // A window is requested to be the given bounds. The request may or
   // may not be fulfilled depending on the requested bounds and window's
@@ -55,18 +54,17 @@ enum WMEventType {
   // A user requested to toggle fullscreen state.
   WM_EVENT_TOGGLE_FULLSCREEN,
 
-  // A user requested a cycle of dock and snap left.
+  // A user requested a cycle of snap left.
   // The way this event is processed is the current window state is used as
   // the starting state. Assuming normal window start state; if the window can
-  // be snapped left, snap it; otherwise progress to next state. If the window
-  // can be docked left, dock it; otherwise progress to next state. If the
+  // be snapped left, snap it; otherwise progress to next state. If the
   // window can be restored; and this isn't the entry condition restore it;
   // otherwise apply the bounce animation to the window.
-  WM_EVENT_CYCLE_SNAP_DOCK_LEFT,
+  WM_EVENT_CYCLE_SNAP_LEFT,
 
-  // A user requested a cycle of dock and snap right.
-  // See decription of WM_EVENT_CYCLE_SNAP_DOCK_LEFT.
-  WM_EVENT_CYCLE_SNAP_DOCK_RIGHT,
+  // A user requested a cycle of snap right.
+  // See decription of WM_EVENT_CYCLE_SNAP_LEFT.
+  WM_EVENT_CYCLE_SNAP_RIGHT,
 
   // A user requested to center a window.
   WM_EVENT_CENTER,