Remove docked windows entirely in M59.

ash/common/wm/window_state.cc

Index: ash/common/wm/window_state.cc
diff --git a/ash/common/wm/window_state.cc b/ash/common/wm/window_state.cc
index fbfa9332336b03589426b8272f4b4455d18c1760..04f737ab16dce75e84a8f246341e97774589f8cb 100644
--- a/ash/common/wm/window_state.cc
+++ b/ash/common/wm/window_state.cc
@@ -34,9 +34,6 @@ WMEventType WMEventTypeFromShowState(ui::WindowShowState requested_show_state) {
     case ui::SHOW_STATE_INACTIVE:
       return WM_EVENT_SHOW_INACTIVE;
 
-    // TODO(afakhry): Remove Docked Windows in M58.
-    case ui::SHOW_STATE_DOCKED:
-      return WM_EVENT_DOCK;
     case ui::SHOW_STATE_END:
       NOTREACHED() << "No WMEvent defined for the show state:"
                    << requested_show_state;
@@ -62,8 +59,7 @@ WindowStateType WindowState::GetStateType() const {
 }
 
 bool WindowState::IsMinimized() const {
-  return GetStateType() == WINDOW_STATE_TYPE_MINIMIZED ||
-         GetStateType() == WINDOW_STATE_TYPE_DOCKED_MINIMIZED;
+  return GetStateType() == WINDOW_STATE_TYPE_MINIMIZED;
 }
 
 bool WindowState::IsMaximized() const {
@@ -106,11 +102,6 @@ bool WindowState::IsActive() const {
   return window_->IsActive();
 }
 
-bool WindowState::IsDocked() const {
-  return GetStateType() == WINDOW_STATE_TYPE_DOCKED ||
-         GetStateType() == WINDOW_STATE_TYPE_DOCKED_MINIMIZED;
-}
-
 bool WindowState::IsUserPositionable() const {
   return (window_->GetType() == ui::wm::WINDOW_TYPE_NORMAL ||
           window_->GetType() == ui::wm::WINDOW_TYPE_PANEL);