Remove the deprecated Alt+Shift shortcut completely

ash/common/accelerators/accelerator_controller.h

 // Copyright (c) 2012 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.
 
 #ifndef ASH_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 #define ASH_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 147 matching lines @@
                      const ui::Accelerator& accelerator);
 
   // Returns whether performing |action| should consume the key event.
   bool ShouldActionConsumeKeyEvent(AcceleratorAction action);
 
   // Get the accelerator restriction for the given action. Supply an |action|
   // of -1 to get restrictions that apply for the current context.
   AcceleratorProcessingRestriction GetAcceleratorProcessingRestriction(
       int action);
 
+  // If |accelerator| is a deprecated accelerator, it performs the appropriate
+  // deprecated accelerator pre-handling.
+  // Returns PROCEED if the accelerator's action should be performed (i.e. if
+  // |accelerator| is not a deprecated accelerator, or it's an enabled
+  // deprecated accelerator), and STOP otherwise (if the accelerator is a
+  // disabled deprecated accelerator).
+  enum class AcceleratorProcessingStatus { PROCEED, STOP };
+  AcceleratorProcessingStatus MaybeDeprecatedAcceleratorPressed(
+      AcceleratorAction action,
+      const ui::Accelerator& accelerator) const;
+
   AcceleratorControllerDelegate* delegate_;
 
   std::unique_ptr<ui::AcceleratorManager> accelerator_manager_;
 
   // A tracker for the current and previous accelerators.
   std::unique_ptr<ui::AcceleratorHistory> accelerator_history_;
 
   std::unique_ptr<ImeControlDelegate> ime_control_delegate_;
 
   // Handles the exit accelerator which requires a double press to exit and
@@ skipping 35 matching lines @@
   std::set<int> actions_needing_window_;
   // Actions that can be performed without closing the menu (if one is present).
   std::set<int> actions_keeping_menu_open_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_H_