Enables ScreenPinningController for mash/mus

ash/mus/bridge/wm_shell_mus.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/mus/bridge/wm_shell_mus.h"
 
 #include <utility>
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
 #include "ash/common/accelerators/accelerator_controller.h"
@@ skipping 186 matching lines @@
   // TODO(mash): implement http://crbug.com/622480.
   NOTIMPLEMENTED();
   return false;
 }
 
 void WmShellMus::SetDisplayWorkAreaInsets(WmWindow* window,
                                           const gfx::Insets& insets) {
   window_manager_->screen()->SetWorkAreaInsets(window->aura_window(), insets);
 }
 
-bool WmShellMus::IsPinned() {
-  // TODO: http://crbug.com/622486.
-  NOTIMPLEMENTED();
-  return false;
-}
-
-void WmShellMus::SetPinnedWindow(WmWindow* window) {
-  // TODO: http://crbug.com/622486.
-  NOTIMPLEMENTED();
-}
-
 void WmShellMus::LockCursor() {
   // TODO: http::/crbug.com/637853
   NOTIMPLEMENTED();
 }
 
 void WmShellMus::UnlockCursor() {
   // TODO: http::/crbug.com/637853
   NOTIMPLEMENTED();
 }
 
@@ skipping 153 matching lines @@
   accelerator_controller_registrar_ =
       base ::MakeUnique<AcceleratorControllerRegistrar>(
           window_manager_, accelerator_namespace_id);
   return base::MakeUnique<AcceleratorController>(
       accelerator_controller_delegate_.get(),
       accelerator_controller_registrar_.get());
 }
 
 }  // namespace mus
 }  // namespace ash